What is the formula of 1-cosx?

 What is the formula of 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

and this is the formula of 1-cos x

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