The Cosine Rule - GCSE Higher Maths

[@WaliullahAhmed-cz7nz]

i cant thank you enough i have moved from foundation to higher and im going yr11 i was having such a hard time understanding this and you just taught me in a matter of minutes

[@1stClassMaths]

Glad to be of service!

[@fast9952]

@@1stClassMathsi'm in 9th grade gotta do this already and the trimester is barely mid term.... I can't imagine 11th grade

[@cocolata9744]

​@@fast9952 you better start imagining it y11 is stressful 😭

[@thatoneguy.3548]

I cannot thank you enough. Listening to this in class helped me so much with learning such a hard concept in year 11

[@ALARIO-uf6wp]

thanks for making me understand this in then minutes, you are incredible

[@1stClassMaths]

You are so welcome!

[@mxiisty_alxynxx]

Yessss tyyy I have an exam tomorrow and I had no clue until I found this 😊😊🎉

[@ammarahissufo6482]

good luck in ur exam

[@mryamsradio]

mines in an hour 😭😭 watching this to learn how to do this

[@ejxnsticks9889]

same lmao

[@starktony1354]

One hour is crazy did you pass?

[@oyunasg9657]

How did your exam go

[@diggisirajo]

This channel is underated

[@1stClassMaths]

Thanks! This comment is underrated.

[@ramratan8426]

Thanks for making me understand a formula which was difficult for me to understand :)

[@ReemAsif]

Thank you so much. You are indeed the best person on this earth and u deserve the whole worlds love

[@1stClassMaths]

Thanks. Might be some slighly better people though!!

[@ZoroZoro-yw2bz]

tysm this channel is so underrated

[@michaelsuja4256]

thanks i will pass my exams

[@neco6696]

this deserves more likes

[@1stClassMaths]

Cheers!

[@kinzabibi7716]

thank you , this video is really helpful!!

[@MetehanErgene-o6f]

Thank you my brother my igc is soon and i forgot this formula

[@TheOnlyZackshadyK98]

thank you very very much, it helped more than enough:))

[@muhammedkadu6592]

Thanks man i got exam in a month

[@anaselkelani3478]

Can you please post a video on quadratic expressions i have a exam after tomorrow plz help

[@Kandeling]

Thank you for explaining however I have one problem, when I type the exact same formula on the calculator, I get a whole different result and it's the same thing with all the other exercises I've done...

[@1stClassMaths]

Hi your calculator is most likely set to the wrong angle unit eg radians.

[@Kandeling]

@@1stClassMaths Yes thank you, I just figured it out

[@1stClassMaths]

Always test sin 30 as you want it to be 0.5 😄

[@RinoVagnoni]

Grazie prof.❤

[@moonknight6411]

W for explaining it so well thank you so much❤❤

[@MuneebMakes]

When I type both of the fractions at 5:44 and 7:00 into my calculator, it gives me totally different answers than to what's shown. Please could you offer some help as to why that could be because I am really stuck on that for the time being

[@1stClassMaths]

Hey. You probably have the wrong angles mode set. Check if your calculator is in degrees mode.

[@MuneebMakes]

ah yeah thanks man my bad @@1stClassMaths

[@errresh473]

Your a legend

[@1stClassMaths]

no you

[@JacksonMaraba-r6u]

Thanks ❤️

[@Goku_Black4444]

FINAL MATHS EXAMMM🎉🎉🎉🎉🎉🎉

[@madblox252]

so USEFULL!!!!

[@khadijaalansi7591]

Thank you 👍🏻

[@damayanthiperera3327]

1st class math = many maths teachers at school and 1.30 hours in 10 minutes

[@danmike2305]

When to use cosine rule as opposed to sine rule ?

[@1stClassMaths]

Explains at the end of the video.

[@Akin-v5d]

@@1stClassMaths is this for gcse math or gcse further math?

[@AmeeraRolle-Marshall]

Would this ever come up in a non calculator?

[@1stClassMaths]

Yes. Quite possibly using an exact trig value like cos30, cos45, cos60 or even cos120.

[@ast3r0id]

does it matter if we put our answer in a different decimal place like 2 dp if they don't specify?

[@1stClassMaths]

Nope you will be ok. I’d go 1 or 2 dp for most if it doesn’t say.

[@siddhantdev4036]

usually the degree of accuracy is mentioned on the front of the paper. its safest to follow that one!

[@yunaa____]

hey my teacher taught us cosine rule as
a²= √b²+c²-2abcos a 1:06

[@1stClassMaths]

What would be a = rather than a^2 =

[@khadijaalansi7591]

I like it too much😍

[@Biggleton1]

paper 3 predicted paper should be the best one!!!

[@m7mdfahd-wn6cf]

LIFE SAVOR THANBK YOU

[@1stClassMaths]

YOU'RE WELCOMBE

[@tastyfood2020]

I wonder why is this formula is similar as this formula
(b-c)^2 i think there might be some relationship
There's just add cos(A) with -2bc
This is suspicious

[@JacobMelia0046]

everything in maths is related coming from a university student, its all connected in subtle ways

[@jawadbaloch7588]

❤❤jawad. T

[@stutilly2332]

Hi .Answer I'm getting at 7.31 is 69.62591067.I've checked that calculator is in degrees.I get the same answer using an online scientific calc. Please help

[@1stClassMaths]

You are not typing in the negative sign.