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Let 0lt alpha lt pi //2 be a fixed angle...

Let `0lt alpha lt pi //2` be a fixed angle. If `P=(cos theta, sin theta)` and `Q=(cos (alpha-theta),sin (alpha-theta))`.
then Q is obtained from P by

A

clockwise rotation around origin through an angle `alpha`

B

Anticlockwise rotation around origin through an angle `alpha`

C

reflection in the line through origin with slope `tan alpha`

D

reflection in the line through origin with slope `"tan"(alpha)/2`

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