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Mathematics
Trigonometry
Trigonometric Identities

How do i find the exact value for:

(cos5pi/16)(cospi/16)+ (sin5pi/16)(sinpi/16)

1 answer
asked by Shelbie
8 years ago
396 views
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2. 0

cosAcosB + sinAsinB = cos(A-B)

so, what is 5π/16 - π/16?

answered by Steve
8 years ago
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