Find the principal value :

$Tan^{-1}[\frac {-1}{√3}]$

Find the principal value :

$Cot^{-1}(\frac{-1}{√3})$

Find the principal value:

$Cosec^{-1} (-1)$

$N=2^9* 3^7*5^4*7^3$ then N is divisible by how many positive perfect square.

If $N= 4^{11}+4^{12}++4^{13}+4^{14}$then how many positive factor of N .

Find the sum of all even factor 64800.

Find the average of factor

3003.

What is the sum of reciprocal of all factor of number 360.

Find the sum of factor 19600

Find the even factor of 4200.

Find the even factor of 3600.