maths formula list class xii
os A\) \(\cos 2A = \cos^2 A - \sin^2 A\) Product-to-Sum and Sum-to-Product: \(\sin A \sin B = \frac{1}{2}[\cos(A - B) - \cos(A + B)]\) \(\cos A \cos B = \frac{1}{2}[\cos(A - B) + \cos(A + B)]\) Features & Benefits: Critical fo