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Let O be the origin and OX, OY, OZ be th...

Let O be the origin and OX, OY, OZ be three unit vectors in the directions of the sides, QP, RP, QR respectively of a `trianglePQR`.
Q. If the triangle PQR varies, then the minimum value of `cos(P+Q)+cos(Q+R)+cos(R+P)` is

A

`-3/2`

B

`5/3`

C

`3/2`

D

`-5/3`

Text Solution

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The correct Answer is:
A
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