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Prove that: sqrt((sectheta-1)/(sectheta+...

Prove that: `sqrt((sectheta-1)/(sectheta+1))+sqrt((sectheta+1)/(sectheta-1))=2\ cos e c\ theta`

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Prove that: sqrt((1-sintheta)/(1+sintheta))=sectheta -tan theta .

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Prove that- (sectheta+tantheta)/(sec-tantheta)=((1+sintheta)/costheta)^2

(tantheta+sectheta-1)/(tantheta-sectheta+1)=

(tantheta+sectheta-1)/(tantheta-sectheta+1)=