Question

Value of 3sin 40-4sin^3 40

Answer 1

Answer:

$\large{\bold{\frac{\sqrt{3}}{2}}}$

Step-by-step explanation:

$Formula\\\\sin3\theta=3sin\theta-4sin^3\theta\\\\Here\\\theta=40^0\\\\3sin40^0-4sin^340^0\\\\=sin(3\times40^0)\\\\=sin120^0\\\\=\frac{\sqrt{3}}{2}$

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