Unit 3 • Class 9Optional Mathematics (Opt.091)
Trigonometry: Compound Angles & Transformations
त्रिकोणमिति: संयुक्त कोणहरू र रूपान्तरण सूत्रहरू
Trigonometric ratios of compound angles sin(A±B), cos(A±B), tan(A±B), multiple angles 2A, 3A, and transformation of products into sums/differences.