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Prove that 4sin^3a∙cos^3a+4cos^3a∙sin^3a=3sin^4a.

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Answer on Question #43732 Math TrigonometryProve that 4 sin3 cos 3 + 4 cos3 sin 3 = 3 sin 4.Solution.To prove identity, we will transform its left part. For this, we can use next formulas:sin 3 = 3 sin 4 sin3 ,cos 3 = 4 cos 3 3 ...
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