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Play - Prove that : sqrt((1-cos^(2)theta)sec^(2)theta)=tantheta
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Play - Prove (tantheta+2)(2tantheta+1)=5tantheta+2sec^2theta.
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Play - about to only mathematics
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Play - if tantheta+sectheta=l then prove that sectheta=(l^2+1)/(2l)
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