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anygoal [31]
3 years ago
13

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

Mathematics
1 answer:
attashe74 [19]3 years ago
3 0
Using the identity :

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

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