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Let O be the origin and vec(OX) , vec(O...

Let O be the origin and` vec(OX) , vec(OY) , vec(OZ)` be three unit vector in the directions of the sides `vec(QR) , vec(RP),vec(PQ)` respectively , of a triangle PQR.
`|vec(OX)xxvec(OY)|=`

A

sin (P + Q)

B

sin 2R

C

sin (P+R)

D

sin (Q+R)

Text Solution

Verified by Experts

The correct Answer is:
A
`|vec(OX)xxvec(OY)|=|vec(OX)||vec(OY)|sin (pi-R)`
`=sin R=sin (P+Q)`
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