3tan^(-1)a" is equal to "

3 tan^(-1) a is equal to

intx^(3)d(tan^(-1)x) is equal to

cos(tan^(-1)3/4)+cos(tan^(-1)x) is equal to

cos(tan^(-1)3/4)+cos(tan^(-1)x) is equal to

2 tan^(-)""1/3+ tan^(-)""1/7 is equal to

The value of tan^(-1) (2) + tan^(-1) (3) is equal to a) (3pi)/(4) b) (pi)/(4) c) (pi)/(3) d) tan^(-1) (6)

If x_(1),x_(2),x_(3),x_(4) are the roots of the equation x^(4)-x^(3)sin2 beta+x^(2)*cos2 beta-x cos beta-sin beta=0, then tan^(-1)x_(1)+tan^(-1)x_(2)+tan^(-1)x_(3)+tan^(-1)x_(4) 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

If x_1,x_2, x_3, x_4 are the roots of the equation x^4-x^3 sin2 beta+ x^2.cos2 beta-xcos beta-sin beta=0 , then tan^-1x_1+tan^-1x_2+tan^-1x_3+tan^-1x_4 is equal to