Question

required solution right now guys going the best from u

Answer 1

refer the pic hope it'll help..
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Answer 2

Given points are (cosæ,sinæ) and (-sinæ,cosæ)

Distance between two points A(x1,y1) , B(x2,y2) is
$\sqrt{ (x2 - x1)^{2} + (y2 - y1)^{2} }$
distance=√[ (-sinæ-cosæ)^2 + (cosæ-sinæ)^2]
=√ [ (-1(sinæ +cosæ))^2 + (cosæ-sinæ)^2 ]
=√ [ sin^2æ+cos^2æ+2sinæcosæ +sin^2æ+cos^2æ -2sinæcosæ ]
=√ [ sin^2æ +cos^2 +cos^2 æ+sin^2 æ]
=√[1+1]
=√2