Question
sin10˚ x sin20˚ x sin40˚ =?
Solution
We know that sin x x sin 2x x sin 4x = 1/4 sin 3x So sin10 x sin20˚ x sin40˚ = 1/4 x sin(3 x 10˚) = 1/4 x sin 30˚ = 1/4 x 1/2 = 1/ 8
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