i have some questions i really need help with sin3 A = 3sin A - 4sin^3 A (Hint use sin3 A = sin(2a + a) and sin3 x / sin x - cos3 x / cos x = 2 please help im stuck
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Originally Posted by dave30001 i have some questions i really need help with sin3 A = 3sin A - 4sin^3 A (Hint use sin3 A = sin(2a + a) um, use the hint! did you try? what did you get? and sin3 x / sin x - cos3 x / cos x = 2 please help im stuck I will start you off: Consider the LHS: now can you finish up?
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