if `tan^(- 1)x=pi/10 ` for some `x in R` then the value of `cot^-1x` is

If tan^(-1) x =pi/10 for some "x"in R , then the value of cot^(-1) x is

If tan ^(-1) x=(pi)/(10) for some x in R then the value of cot ^(-1) x is

If tan^-1 x = pi/10 for some x in R, them the value of cot^-1 x is

If cot^(-1)x=(2pi)/5 for some x in R , the value of tan^(-1) x is ........

If cot^(-1) x = (2pi)/7 for some x in R the value of tan^(-1) x is :

If tan^-1x=pi/10 ,then the value of cot^-1x is

If cot^(-1)x=(2pi)/(5)"for some"x""inR,"the value of"tan^(-1)x is

The value of tan^(-1)x+cot^(-1)x is

The solution set of inequality (cot^(-1)x)(tan^(-1)x)+(2-pi/2)cot^(-1)x-3tan^(-1)x-3(2-pi/2)>0 is (a , b), then the value of cot^(-1)a+cot^(-1)b is____