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" If "3tan theta tan varphi=1," then pro...

" If "3tan theta tan varphi=1," then prove that "2cos(theta+varphi)=cos(theta-varphi)

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If 3tanthetatanvarphi=1 , then prove that 2cos(theta+varphi)=cos(theta-varphi) .

If 3 tan theta tan phi=1 , then prove that 2 cos (theta+varphi)=cos (theta-varphi) .

If 3 tan theta tan phi=1 , then prove that 2 cos (theta+varphi)=cos (theta-varphi) .

If 3tan theta tan phi=1, then prove that 2cos(theta+phi)+cos(theta-phi)=0

If 3 tan theta tan phi=1 , then prove that 2 cos (theta+phi)=cos (theta-phi) .

If 3 tan theta tan phi=1 , then prove that 2 cos (theta+phi)=cos (theta-phi) .

If 3tan theta tan phi=1. Prove that 2cos(theta+phi)=cos(theta-phi)

If tan^4theta - tan^2 theta= 1 , then prove that cos^4theta+ cos^2theta = 1

If t a n^2theta=2t a n^2varphi+1 , prove that cos2theta+ sin^2varphi=0.

If t a n^2theta=2t a n^2varphi+1 , prove that cos2theta+sin^2phi =0.