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Prove that:tan4x=(4tanx(1-tan^2x))/(1-6t...

Prove that:`tan4x=(4tanx(1-tan^2x))/(1-6tan^2x+tan^4x)`

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MODERN PUBLICATION-TRIGONOMETRY-FREQUENTLY ASKED QUESTIONS
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  17. Prove that:tan4x=(4tanx(1-tan^2x))/(1-6tan^2x+tan^4x)

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