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

The sum of the series cot^(-1)((9)/(2))+cot^(-1)((33)/(4))+cot^(-1)((129)/(8))+…….oo is equal to :

The sum of the series cot^(-1)((9)/(2))+cot^(-1)((33)/(4))+cot^(-1)((129)/(8))+…….oo is equal to :

The sum of the series cot^(-1)((9)/(2))+cot^(-1)((33)/(4))+cot^(-1)((129)/(8))+…….oo is equal to :

cot^(-1)(-2) is equal to

cot^(-1)(-2) is equal to

If the mapping f(x)=ax+b, a>0 maps [-1,1] on to [0,2] then cot[cot^(-1)(7)+cot^(-1)(8)+cot^(-1)(18)] is equal to

The value of 2(cot^(-1))(1)/(2)-(cot^(-1))(4)/(3) is

tan^(-1) (-1) -cot^(-1) (1) is equal to

The value of sin\ (1/2cot^(-1)(-3/4))+cos(1/2cot^(-1)(-3/4)) is/are equal to-