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

Prove: tan4x =4tanx (1-tan^2x)/1-6 tan^2x + tan^4x . Prove: cos4x = 1-8 sin^2 x cos^2 x . Prove: cos6x = 32 cos^6 x - 48 cos^4 x + 18 cos^2 x - 1 . Trigonometric functions. Trigonometric most important questions.

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