Let a
2
0, be fixed. If the integral
tan x – tan
tan x tan dx = A(x) cos 2 + B(x) sin 2 + C, where C is a
constant of integration, then the functions A(x) and B(x) are respectively :
(1) x – and loge|cos(x – )| (2) x + and loge|sin(x – )|
(3) x + and loge|sin(x + )| (4) x – and loge|sin(x – )|
