Use the half-angle formulas to find the exact value of the trigonometric function cos-22.5°.

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A: A=118 degree b=16c=25

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A: Limx-0).

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A: Let's find the question Number is 62 : -Theata= -3π/2

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A: The figure

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Q: Write the trigonometric expression in terms of a single trigonometric function. 2 sin 5x cos 5α

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Q: 2 csc 2x = tan x + cot x

A: Prove the following identity.