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How do i prove sin3x=3sinx-4sinx?

1 Answer

As of my knowledge question was wrong, i think that question is sin(3x) = 3sin(x) - 4sin^3(x)

Left hand side identity

Apply sum of angles formula

Apply double angle formulas

From pythageron identitiey

= Right hand side identity.

answered Jul 21, 2014 by david Expert
edited Jul 21, 2014 by david

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