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loldiv:
cospi/4cospi/6=1/2(---pi/12+cos5pi/12)
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Tranquility:
What is the question asking you to do exactly? Do you know these identities
Tranquility:
For your question, it's derived from the cosine addition and subtraction identities \(\cos(a+b) + \cos(a-b) = 2 \cos (a) \cos (b)\)
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