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If `(a+b)tan(theta-phi)=(a-b)tan(theta-phi)`and `acos2phi+bcos2theta=c`show that `a^2-b^2+c^2=2a cos2phi`

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UNITED BOOK HOUSE-TRIGONOMETRY-EXERCISE
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  2. If (ax)/costheta+(by)/(sintheta)=a^2-b^2 and (axsintheta)/(cos^2theta)...

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  6. If n^2sin^2(alpha+beta)=sin^2alpha+sin^2beta-2sinalphasinbetaxxcos(alp...

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  7. If (a+b)tan(theta-phi)=(a-b)tan(theta-phi)and acos2phi+bcos2theta=csho...

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  8. If (tan3alpha)/(tanalpha)=lambda,show that (sin3alpha)/(sinalpha)=(2la...

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  16. If the medians of a triangle ABC makes anglesalpha,beta,gammawith each...

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