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Suppose you want to use a Half-Angle Identity to find the exact value of the...

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Basic Math

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Suppose you want to use a Half-Angle Identity to find the exact value of the following expression.cos 67.5A.cos 67.5 =?1 + cos___/2B.cos 67.5 =-?1 + cos___/2C.cos 67.5 =-?1 + cos___/2D.cos 67.5 =?1 + cos___/2

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