Hey !!!from LHS sin20° sin40° sin60° sin80° sin60° sin20 sin40° sin80° √3/2 sin20° sin40° sin80° we KNOW a defined rule ⚜ SINX sin ( 60° - x ) sin ( 60° + x) = similarlyhence, LET x = 20 ° then = √3/2 × 1/4sin 3*20° = √3/2 ×1/4sin60° √3/2*√3/2 ×1/4 = 3/16 LHS = RHS prooved ♻ _____________________________ Hope it HELPS you !!!!
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