Distance between the point (Cos theta,sin theta),(sin theta,cos theta)
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√(sin theta - cos theta)²+( cos theta- sin theta)²
=√ sin² theta+cos² theta -2. sin theta .cos theta+ cos² theta+sin² theta-2 cos theta sin theta
=√1-2sin theta +1-2sin theta
= 2√2sin theta. √cos theta.
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