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= (sin 2A) cos A + (cos 2A) sin A
ubah
sin 2A = 2 sin A cos A
cos 2A = 1- 2 sin² A
= (2 sin A cos A) cos A + (1 - 2 sin² A)sin A
= 2 sin A (cos² A) + sin A- 2 sin³ A
ubah cos²A = 1 - sin² A
= 2 sin A (1 - sin² A) + sin A - 2 sin³ A
= 2 sin A - 2 sin³ A + sin A - 2 sin³ A
= (2 sin A + sin A) + (-2 sin³ A - 2 sin³ A)
= 3 sin A - 4 sin³ A