The positive integer value of n > 3 satisfying the equation , is
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[sin 3 – sin ] sin 2 = sin sin 3
2 sin cos 2 sin 2 = sin sin 3
sin 0
2 cos 2 sin 2 = sin 3
sin 4 = sin 3
so either 4 = 3 or 4 = – 3
so = 0 or = /7 so n = 7