4 years ago

Rewrite 1−2 sin ^2 (22.5∘) using a double-angle identity.

1 answer:

3 0

Using the identity :

Cos (2a) = 1-2 Sin^2(a)

Therefore :1−2 sin ^2 (22.5∘) = Cos(2a)
= Cos (2 * 22.5) = Cos 45

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