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28 August, 11:41

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

A. sin 45

B. sin 11.25

C. cos 11.25

D. cos 45

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Answers (1)
  1. 28 August, 12:29
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    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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