(1 + SIN2X )COSX + ( 1 + COS2X)SINX = 1+SIN2X. 7/ 4SIN 3 .  ...

6/ (1 + sin

²

x )cosx + ( 1 + cos

²

x)sinx = 1+sin2x. 7/ 4sin 3 .   sinx x 42  (1cos)x( x . 9/ xsin 42cos .