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How would you verify tan3x = (3tanx - tan^3 x) / ( 1 - 3tan^2 x) and sin4x = (cosx)(4sinx - 8sin^3x) step-by-step?
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How would you verify tan3x = (3tanx - tan^3 x) / ( 1 - 3tan^2 x) and sin4x = (cosx)(4sinx - 8sin^3x) step-by-step?

User Minnie
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Hope this helps you.
How would you verify tan3x = (3tanx - tan^3 x) / ( 1 - 3tan^2 x) and sin4x = (cosx-example-1
How would you verify tan3x = (3tanx - tan^3 x) / ( 1 - 3tan^2 x) and sin4x = (cosx-example-2
User Nmgeek
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