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Help I don’t get how they did this which double angle formula do they use
(edited 11 months ago)
Original post by Alevelhelp.1
Help I don’t get how they did this which double angle formula do they use
Sin(2W) = 2SIn(W)Cos(W)
Original post by Alevelhelp.1
Help I don’t get how they did this which double angle formula do they use
You need to get this imprinted on your brain!
This is an IDENTITY - this means it is valid whatever you stick in place of A.
So, A = B/2 gives
sinB = 2sin(B/2)cos(B/2)
A = 2C gives
sin(4C) = 2sin(2C)cos(2C)
A = TaylorSwift gives
sin(2TaylorSwift) =2sin(TaylorSwift)cos(TaylorSwift)
etc etc
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