If sin(pi/10) = 0.309, determine the value of cos(2pi/5) and explain why.

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answerhappygod
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If sin(pi/10) = 0.309, determine the value of cos(2pi/5) and explain why.

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If sin(pi/10) = 0.309, determine the value of cos(2pi/5) andexplain why.
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