Class 8 / IIT Foundation Plus Maths / Multiples And Sub-Multiples / Proof For the Formulas - 5, 6, 7 And 8

Multiples And Sub-Multiples

Multiples And Sub-Multiples We know,        \( \sin 3A = \sin (2A + A) = \sin 2A.\,\cos A + \cos 2A\,\,.\sin A \)           &nbs