4sinA.sin(60-A).sin(60+A) = sin3A
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take the value of A as 30°
therefore,
LHS=4sin30°(sin30°)(sin90°)
=4×1/2×1/2×1
=1
Rhs=sin90°=1
LHS=RHS
therefore,
LHS=4sin30°(sin30°)(sin90°)
=4×1/2×1/2×1
=1
Rhs=sin90°=1
LHS=RHS
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