Question

1+ sinx =
1-cosx =
write the formula​

Answer 1

1) 1+ sinx =

1 + sinx = [cos(x/2 ) + sin(x/2)]^2

2) 1-cosx =

we know that cos 2x=cos^2 x-sin^2 x

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

cos 2x=1–2sin^2 x

by this

1- cos 2x = 2sin^2 x

putting x=x/2;we get ,

1- cos x = 2sin^2 x/2

hope it will help you....

Answer 2

Answer:

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