Prove that sin^3 x + sin^3 (2pie/3 +x) + sin^3(4pie/3 +x) = -3/4 sin 3x

[Dhanalakshmi]

Prove that sin³ x + sin³ (2pie/3 + x) - sin³(4pie/3 + x) = -3/4 sin 3x

[Dhanalakshmi]