If `sum_(i=1)^nsinx_i=n` then `sum_(i=1)^ncotx_i=`

If sum_(i=1)^(n)sin x_(i)=n then sum_(i=1)^(n)cot x_(i)=

If sum_(i=1)^n (x_i -a) =n and sum_(i=1)^n (x_i - a)^2 =na then the standard deviation of variate x_i

If sum_(i=1)^(2n) sin^(-1) x_i=npi , then sum_(i=1)^(2n) x_i equals :

If sum_(i=1)^(2n) sin^(-1) x_i =npi , then sum_(i=1)^(2n) x_i is equal to :

sum_(i=1)^n costheta_i=n then sum_(i=1)^n sintheta_i

sum_(i=1)^(n)cos theta_(i)=n then sum_(i=1)^(n)sin theta_(i)

If barx=1/n sum_(i=1)^n x_i then prove that sum_(i=1)^n (x_i-barx)=0

If sum_(i=1)^(2n)cos^(-1)x_(i)=0 , then sum_(i=1)^(2n)x_(i) is :

The standard deviation of n observations x_(1),x_(2),......,x_(n) is 2. If sum_(i=1)^(n)x_(i)=20 and sum_(i=1)^(n)x_(i)^(2)=100 then n is