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Help with differentiation Q

can someone help me with part b of this question? Thank you :smile:

https://imgur.com/y46waCa
Reply 1
Original post by alaraa_
can someone help me with part b of this question? Thank you :smile:

https://imgur.com/y46waCa

Remember
dy/dx = dy/dt*dt/dx
And a bit of trig identities should get you there?
Upload your attempt if you get stuck.
Reply 2
Repeated thread.
Pls reply to the original one.
Original post by alaraa_
could someone help me with part b of this question? Thank you.https://imgur.com/y46waCa


You would it it useful to note that

sin(x) = sin(2 * x/2) = 2sin(x/2)cos(x/2)

cos(x) = cos(2 * x/2) = 1 - 2sin^(x/2)
Reply 4
Original post by RDKGames
You would it it useful to note that

sin(x) = sin(2 * x/2) = 2sin(x/2)cos(x/2)

cos(x) = cos(2 * x/2) = 1 - 2sin^(x/2)

Oh thanks, are we meant to know those identities?
Original post by alaraa_
Oh thanks, are we meant to know those identities?


Its just the compound angle identity, or at least its the specific half angle formulae.

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