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Asked by Shelbie

How do i find the exact value for:
(cos5pi/16)(cospi/16)+ (sin5pi/16)(sinpi/16)
9 years ago

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Answered by Steve
cosAcosB + sinAsinB = cos(A-B)

so, what is 5π/16 - π/16?
9 years ago
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How do i find the exact value for:
(cos5pi/16)(cospi/16)+ (sin5pi/16)(sinpi/16)

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