Question

1 - COSx = 2 sin² x/ 2 prove it

For 50 points​

Answer 1

Explanation:

1−cos(x)=2sin2(x2). Digress, for a moment, to the identity cos(2u)=1 −2sin2(u). Substitute u = x/2:.

Answer 2

u=x/5 is the answer

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