Need help solving this problem please

asked Aug 2, 2022 207k views

3 votes

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5 votes

Explanation:

$\cos( ( \alpha )/(2) ) = \sqrt{ (1 - \cos( \alpha ) )/(2) } \\ = \sqrt{ (1 - ( - (15)/(17)) )/(2) } \\ = \sqrt{ (32)/(34) }$

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