find the value of sin 18
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2θ = 90˚ - 3A.
Taking sine on both sides, we get.
sin 2A = sin (90˚ - 3A) = cos 3A.
2 sin A cos A = 4cos^3 A - 3 cos A.
Taking sine on both sides, we get.
sin 2A = sin (90˚ - 3A) = cos 3A.
2 sin A cos A = 4cos^3 A - 3 cos A.
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