`2 tan^(-1) (-2)` is equal to

2tan^(-1)(-2) is equal to (a) -cos t^(-1)((-3)/5) (b) -pi+cos^(-1)3/5 (c) -pi/2+tan^(-1)(-3/4) (d) -picot^(-1)(-3/4)

2tan^(-1)(-2) is equal to (a) -cos^(-1)((-3)/5) (b) -pi+cos^(-1)3/5 (c) -pi/2+tan^(-1)(-3/4) (d) -pi+cot^(-1)(-3/4)

2tan^(-1)(-2) is equal to (a) -cos t^(-1)((-3)/5) (b) -pi+cos^(-1)3/5 (c) -pi/2+tan^(-1)(-3/4) (d) -picot^(-1)(-3/4)

2tan^(-1)(-2) is equal to (a)-cos t^(-1)((-3)/(5))(b)-pi+(cos^(-1)3)/(5)(c)-(pi)/(2)+tan^(-1)(-(3)/(4)) (d) -pi cot^(-1)(-(3)/(4))

1/2tan^(- 1)(12/5) is equal to

tan^(-1)(1/2)+tan^(-1)(1/3) is equal to

tan^(-1)(1/2)+tan^(-1)(1/3) is equal to

tan[cos ^(-1){sin(2tan^(-1)2)}] is equal to