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how would you verify this trig identity (1+cos(x) / 1cos(x))  (1cos(x) / 1+cos(x)) = 4cot(x)csc(x) ? 
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I need help with verifying these trig identities: 1) sin4x = 4sinxcos  8sin^3 x cos x 2) cos3x = cos^3 x  3sin^2 x cos x