If p,q are the lengths of the perpendiculars from the origin to xcos alpha - ysin alpha=sin 2alpha ; xsin alpha+ ycos alpha = cos 2alpha then p²+q²=
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p,q are the lengths of the perpendiculars from the origin to xcos alpha - ysin alpha=sin 2alpha ; xsin alpha+ ycos alpha = cos 2alpha then p²+q
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