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Let a, b,c are respectively the sines an...

Let a, b,c are respectively the sines and p, q, r are respectively the consines of `alpha, alpha+(2pi)/(3) and alpha+(4pi)/(3)`, then :
Q. The value of `(ab+bc+ca)` is :

A

0

B

`-(3)/(4)`

C

`-(1)/(2)`

D

-1

Text Solution

Verified by Experts

The correct Answer is:
B
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