The distance between the points (costh...

The distance between the points `(costheta,sintheta)` and `(sintheta,-costheta)` is

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What is the distance between the points A(sintheta-costheta,\ 0) and B(0,sintheta+costheta) ?

Prove: (costheta)/(1+sintheta)=(1-sintheta)/(costheta)

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Prove: (1-costheta)/(sintheta)=(sintheta)/(1+costheta)

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If {:A=[(cos theta,sintheta),(-sintheta,costheta)]:}," then A.A' is

Find the inverse of the matrix [(costheta ,sintheta) ,( -sintheta ,costheta )] .

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(1+costheta+sintheta)/(1+costheta-sintheta)=(1+sintheta)/(costheta)

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