Cosine rule || Trigonometry ||

[@enerstkalenga3673]

Honestly speaking, sir you are so much of help. May God bless you. Sometimes I feel like following you twice 😂😂😂

[@ayuenbuol2404]

Very good keep thinking 🤔🤔

[@ChisangaCarol-g6d]

Thank very much my sir

[@Allardy-o3f]

Thanks Sir

[@TomTom-yw4pm]

There is a mistake!!
The angle you derived is ∠A not ∠B.
∠B=96.77°

[@kamwiwalubita4310]

True

[@rosechaliwanda9103]

Yes thus what am finding me also 96.7

[@bwalyamulenga25]

No,the question actually says calculate the angle BAC not ABC thats why he used B because he wrote down ABC

[@TomTom-yw4pm]

@@bwalyamulenga25 : The presenter realized his mistake, but you keep rolling with it. Imagining the future of pupils you taught.

[@veronicamulenga5629]

He was looking for A the angle we want is B and me it came out 96.77 and when we round off it's 96.8

[@KayceeNalwimba]

Well explained sir God bless you

[@PaulinaChipola]

Thank u very much sir I really enjoy your teaching

[@MutintaHamuwele-jv7db]

Thank you sir for your lessons

[@Pros1992]

Thankyou sir you are a blessing to many

[@jacobsichambaonlinemath5090]

I'm humbled

[@januaryzimba]

Fantastic teaching and i will stick to your lessons sr

[@anniebanda5667]

Sir I enjoy your teaching😊😊

[@thealmigthy-g4f]

thank you i will make you proud

[@NelmasKapema]

This man 😮😮😮you have a heart of dove♥️God bless you

[@MutintaSimusandu-hi5iy]

Thanks Sir, you are the best 🙏🙏

[@ayuenbuol2404]

I keep thinking of this math 😅😅

[@Alice-r3z]

Thank you very much sir because you are helping me I'm very poor in math but because of you I'm catching up

[@AliceKanche]

Sir I'm a bit confused is this also a correct fomular b^2=a^2+c^2-2a(2.5)cosb

[@juliusbandanjoyi9675]

I'm confused too. Coz 2021 paper he said when solving for angle B u the formula starts by b2 now here it's different

[@AgathaMusonda-mr4mb]

Thanks🎉❤❤❤ for the help sir

[@ClintonChipoya-s5r]

Now what if you have been given two sides and an angle what could you use? Cosine or sine

[@sandrakatongo-jz6id]

This is good. I thought b is supposed to be infront since it's where the angle is
Eg:b =a+c=2_ac(2.5(1)cos B

[@jacobsichambaonlinemath5090]

It's also okay

[@meyamwape6909]

Can you do probability for 2022

[@sexessimbule8761]

​@@jacobsichambaonlinemath5090 Sir kindly drop me your line This is Gerrard Simbule from is now doing teaching at Kwame Nkrumah university

[@Chilufya2005]

It was giving a different number when I used b instead of a I'm so confused

[@veronicamulenga5629]

Me too

[@websterchileshe3937]

Sir , to have the right answer the formula to use is b^2=a^2 +c^2-2accosB

[@jacobsichambaonlinemath5090]

Are you finding a different answer

[@websterchileshe3937]

Yes sir

[@zyowelichachi1071]

He's right

[@ireenzulu-hn4yi]

​@@jacobsichambaonlinemath5090is that formula wrong

[@MercyMusumali-hm9xc]

Intelligent teacher

[@asedibanda3063]

I always enjoy your lessons sir😊

[@PlamediMary-mt6oq]

Good work

[@EdwardTembo-f4b]

Mr sichamba you are really a help to us thank you and may God bless you more and more sir.

[@mpcephase4065]

But sir the angle they were looking for was B but you put A instead of B,why? Please I'm behind

[@vanwickdaka-xf5so]

Indeed

[@harrisontembo9844]

so when you start with b the answer is going to different.
you need to re-do this question sir

[@JulianaBanda-dn5vs]

May God bless you🙏🙏

[@ShellyNdunge]

Truly you are a God sent.Thax

[@JosephShilamba-q3m]

Thanks i got something 👏👏👏

[@ChingaMukonda]

Sir I want to know more about this topic

[@ChizawuChiteta-cy1pr]

Thank you very, very ,very much sir

[@EsnartChisenga-y3u]

Wow good teacher

[@اساماسام-ذ7ش]

Thank you very much, stadium

[@NaomiMoonga-em5zu]

Wonderful teaching

[@jacobsichambaonlinemath5090]

Thank you!

[@odettewankusi9849]

How you can see that is cosine rule which is needed to use?

[@IzoKey-iy9zq]

Thanks your for the teaching me

[@KelvinKabwe-db5xp]

Sir u are supposed to start with 2.8^2 that's where angle B is

[@princessmwanza-io4tv]

Mr sichamba thank you for your lessons

[@MeritMuyabemafuwa]

Sir is it wrong to use letter b at the first there or what since we are finding it's angle

[@kjonassmooth]

Legend watching this day before exam

[@TrustChilayi-z2z]

Thanks alot sir

[@PAULAKAKELO]

May god bless u

[@PortiaMkhwananzi]

Thank you for helping

[@JulianaBanda-dn5vs]

Sir how about this formula can I use it Cos(a^2+c^2-b^2÷2ab)

[@counselhachizimba1473]

Wow ❤️ sir you really teach honestly

[@sandramwansa613]

Thank you so much Sir

[@jacobsichambaonlinemath5090]

Most welcome

[@FelixNsama-hc3fl]

God bress

[@webbymubita9332]

There is a mistake sir, you have calculated for the angle at A not B

[@HenryMweshi]

you're finding Angle B but why in the formula u started with a instead of b

[@FabriceDoshim]

To sincerely with... This is absolutely wrong... Revisit the consent on cosine rule

[@BettyAsiat]

I like it

[@beverlychanda-cn7kp]

can we round it off to 63°

[@JonathanChibale-x5k]

Thank you for your time

[@brightsoko1618]

What formula do we use if we're only give two sides?

[@p4steled]

a^2=b^2+c^2-2bc x cos(A) the sqr root your answer ( i think so but im not really sure sorry :,) )

[@HiireAmbrose]

Thanks mr Jacob

[@cleopatrabanda8245]

Sir what if you are not given the all sides

[@mutintamweemba2996]

I enjoyed today's class

[@henningferber9429]

Sir..can you also help us with solving trignometry graphs

[@jacobsichambaonlinemath5090]

Sure

[@mccreed970]

thank sir for your help

[@jacobsichambaonlinemath5090]

Always welcome

[@ChiwanzaMYombwe]

I also think this is absolutely wrong .... Sir I have a question don't u first have to make cos B the subject of the formula... And the angle u have derived is angle A and not angle B .

[@ROBBYZambia-my9nr]

We are together sir

[@ThabileCelia]

God bless you sir ,making math to be understandindable❤

[@PezoKasanda-vm1xn]

Your lessons help me alot❤

[@annabelfavormavi1885]

Thank you for really appreciate you 👏👏👏

[@jacobsichambaonlinemath5090]

You are so welcome

[@joshuaonyekwe1306]

Why did you use cos b

[@NgumCharlotte-f3r]

Please sir where is 2.59 from

[@ireenzulu-hn4yi]

Im confused
The formula

[@ANDREWKASHITAKALUMBA]

Sir please can you come again

[@EvelynLungu-x3t]

🎉

[@akonehpromise6107]

I don't agree. Your labeling is wrong and different from the actual letters in the formula

[@KelvinKamanda-lt2td]

helping alot

[@Chichi-k2x]

I saw this question in the 2022 exam paper 😮😅

[@onesmusmoses]

Thank you sir

[@saviourngandu5271]

This is not true ,we should use sin rule

[@saviourngandu5271]

I haven't seen we have to use sin rule

[@jacobsichambaonlinemath5090]

​@@saviourngandu5271 are you sure?

[@jacobsichambaonlinemath5090]

​@@saviourngandu5271 are you sure?

[@guztoone170]

Sir I didn't found the same answer as yours

[@josiahsikaonga5453]

Sorry sir to say this but there is an error in ur sloving

[@Joskyhaitian]

There's something wrong on the formula 😢

[@Jones-l3e]

I got a different answers from what you did

[@EvansNiyonkuru-fl2qs]

thank you Mr Jacob improving life's 🌴

[@CostenDax]

Sir we were given all the sides why are u using that formula 😮

[@jacobsichambaonlinemath5090]

Which formula do you want to use?

[@BERTHAKAUYEMBI]

Please sir can you help me with question 2 paper One 2017 internal

[@PeterMakumba]

No sir you made a mistake!!! The question is saying calculate the angle ABC instead you solved angle ACB🙄

[@KelvinKabwe-db5xp]

Redo this one sir. Some learners will get it wrong.

[@EdinaSibale-sd4tt]

Edinah am watching sinazongwe

[@josiahsikaonga5453]

Sorry sir the answer is 96.8 please recalculate

[@chalwedavy8538]

Don't mislead people. Your calculations are incorrect.

[@PatriciashumbaDzete]

The answer is wrong you made a mistake sir

[@ALICKMWABA-hu3zn]

Am confused

[@MupatwaMwandemena-ww9mp]

Stop saying thank you this is wrong

[@tks8724]

Why

[@ABDULLAHBUTT-ip1ub]

you are beautiful

[@IchinsoCikayazm]

You are wrong sir for the formula

[@lulu9261]

Yeah it's supposed to be b²=a²+c²-2accosB

[@janetmulenga-ou2lr]

With due respect, sir this is excellently WRONG!!!!!

[@AhmedEdnigir]

Big mistake

[@AlamudinSharif]

How to mistake

[@charlessebente5109]

You're solving for a wrong angle comrade, revisit your working

[@AhmedEdnigir]

No no no no

[@AhmedEdnigir]

No

[@AhmedEdnigir]

b2=a2+c2_2ac cosB

[@Memory-z1q]

Totally wrong on the formula you it states that you are finding angle A and not B go and recheck sir🤝🥱

[@sandrakatongo-jz6id]

This is good. I thought b is supposed to be infront since it's where the angle is
Eg:b =a+c=2_ac(2.5(1)cos B

[@jacobsichambaonlinemath5090]

Also fine

[@madarajobs974]

But you will get different answers

[@innocentnjobvu7266]

I'm in support that b was supposed to be Infront unless it's giving us same answer then it's fine

[@gospelsongs2582]

Yes b is supposed to be in front.

[@gospelsongs2582]

You re correct

[@ChansaPurity-kz1yu]

Thank you so much sir

[@MukumbelasibesoSibeso-iq1op]

Thank you sir

[@FalessBanda]

Thank you so much sir