Question

If, u = (1 + cosA) (1 + cos2A) - sinAsin2A and v = sinA (1 + cos2A) + sin2A (1 + cosA), then prove that, u^2 + v^2 = 4 (1 + cosA)( 1 + cos2A).​

Answer 1

If, u = (1 + cosA) (1 + cos2A) - sinAsin2A and v = sinA (1 + cos2A) + sin2A (1 + cosA), then prove that, u^2 + v^2 = 4 (1 + cosA)( 1 + cos2A).