WMA14 01 IAL (Edexcel) P4 June 2021 Q6 Integration Parametric Equations Cartesian Conversion

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[@sabrinab4827]

i have so much respect for you sir. you help me alot with my struggles while solving papers.thank you. an avid viewer

[@MrHassaansMathsChannel]

Im glad to be of help

[@sneax983]

Sir in part a(i) where you worked out the value of t1 and t2, how can we know where to substitute x and y, for example if we substituted the x in t2 we would have the opposite value.

[@dontbeprocrastinate]

me2 I'm still confused about it.

[@Shenal-Alex]

Listen from 4:58

[@warougekiyyin4025]

Hello sir. Why did you keep the cos(t) as it is?

[@odismom1205]

did you find out why

[@bettysubs9878]

same im so confused

[@MrHassaansMathsChannel]

Pls watch the following video... its like my way of reversing the chain rule...ua-cam.com/video/QQ5BFDjA5-8/v-deo.htmlfeature=shared

[@MrHassaansMathsChannel]

Pls tell me if you understood after watching it

[@odismom1205]

@@MrHassaansMathsChannel i did thank you

[@fatemamohamedwaly1117]

At 13:19 can i make sint subject of formula in x equation n substitute it in y equation?

[@AndrewTota]

9:14 why didnt we use 0.5 + 1/4 sin(2t) ??

[@randomx31x84]

sir forpart b) if i first rearrange to find sint in the x=2cos2t equations and then substitute the sint value in the y=4sint value i should be getting the correct answer as well but for some reason im not getting it ,even though it should technically be correct

[@nonononononono33]

sir, at 4:43 ,in the question it is 32 not -32 , i am confused because when i solved it i also got -32

[@MrHassaansMathsChannel]

Keep on watching... i explain that later

[@nonononononono33]

@@MrHassaansMathsChannel thank youu💖💖💖

[@mansibhatia7092]

in part ai, where you worked out the value of t1 and t2, how can we know where to substitute x and y, for example if we substituted the x in t2 we would have the opposite value.

[@bandugom4999]

thank so much for the explanation my p4 exam is in 2 days do you advise me to revise the integration of pure 3?

[@MrHassaansMathsChannel]

Yes.. and the trig identities especially in differentiation and integration with them

[@ahsanrimon2664]

Sir, you did not clear the issue "when and which one to consider t1 and t2" to get the ans, I took pi/4 as t2 and 0 as t1 while doing

[@MrHassaansMathsChannel]

Seems like u stopped mid sentence

[@fatemamohamedwaly1117]

at 7:18 isn't t2 = 2 cuz y is 0 so we get t from y equation and put it in x equation and get x then get t2?

[@bvialastered9270]

sir, can we use integration by parts instead of reverse of chain rule for this equation?

[@MrHassaansMathsChannel]

In integration by parts...in general one of the parts should get simpler when differentiating .. not the same or more complicated... in this case parts will not help... try it and let me know. There are some special cases where it can work

[@sha3tyb0i41]

why did you use the y= equation to find the upper limit

[@antisocialbarbie1587]

Sin^2 no double angle formulae for cos?

[@MrHassaansMathsChannel]

Pls watch my video about reversing the chain rule... if it was only sin²@ on its own then yes... if its multiplied by cos @ then we use reverse of the chain rule

[@phantom0149]

Okay I don’t get it , can’t we use the cos double angle for sin^2x

[@MrHassaansMathsChannel]

i'll respond when P3 is over

[@antisocialbarbie1587]

​@@MrHassaansMathsChannel sir respond here I am stuck

[@MrHassaansMathsChannel]

Why would we want to make.life more complicated when we can set it up for reversing the chain rule...