Class 8 / IIT Foundation Plus Maths / Multiples And Sub-Multiples / Proof For the Formulas - 13, 14, 15 And 16

Multiples And Sub-Multiples

Multiples And Sub-Multiples We know      sin3A=3 sinA - 4 sin3A     Put A =\( \frac{A} {3} \)     sinA = 3sin\( \frac{A} {3} \) - 4sin3\