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Prove that: "tan"3 theta tan 2theta t...

Prove that:
`"tan"3 theta tan 2theta tan theta="tan" 3theta-"tan" 2theta-"tan" theta.`

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MODERN PUBLICATION-TRIGONOMETRY-FREQUENTLY ASKED QUESTIONS
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  10. If tan(picostheta)=cot(pisintheta), then cos(theta-(pi)/(4))=pm(1)/(2s...

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  12. If A and B are positive acute angles and cos A = 1/7, cos B = 13/14, t...

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  19. (cosalpha+cosbeta)^2+(sinalpha-sinbeta)^2=4cos^2(alpha+beta)/2

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  20. If "sin" theta+"sin" phi=sqrt3(cos phi-cos theta),prove that: "sin"...

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