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If tan(alpha/2) and tan(beta/2) are the ...

If `tan(alpha/2)` and `tan(beta/2)` are the roots of the equation `8x^2-26x+15=0` then `cos(alpha+beta)` is equal to

A

(-627/725)

B

627/725

C

(-725/627)

D

(-1)

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The correct Answer is:
A
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