1.

Let 0ltalphaltpi/2 " be a fixed angle.If " P(costheta,sintheta) and Q(cos(alpha-theta),sin(alpha-theta)) then Q is obtained from P by

Answer»

CLOCKWISE rotation AROUND origin through an angle`alpha`
ANTICLOCKWISE rotation around origin through an angle `alpha`
REFLECTION in the line through origin with slop that `alpha`
reflection in the line through origin with slope `tan " alpha/2`

Answer :D


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