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`cos (pi)/(16)+ cos (3pi)/(16)+ cos (13pi)/(16)+cos (15 pi)/(16)`=

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in Mathematics by (121k points)
`cos (pi)/(16)+ cos (3pi)/(16)+ cos (13pi)/(16)+cos (15 pi)/(16)`=
A. 1
B. `-1`
C. -1/4
D. none of these
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1 Answer

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Correct Answer - C
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