" If "x+sqrt(()15)=4," then "x+1/x=

If x=8 + 2sqrt(15) , then the value of sqrt(x) + 1/sqrt(x) is:

If x=sqrt(2+sqrt(2)), then x^(4)+(1)/(x^(4)) is

If x=4-sqrt(15), find the value of (sqrt(x)+(1)/(sqrt(x)))

If x = 4 +sqrt(15) . Find the value of x^(2) +(1)/(x^(2)) and x^(3) + ( 1)/(x^(3))

If x+sqrt(x^(2)-1)+(1)/(x+sqrt(x^(2)+1))=20 then x^(2)+sqrt(x^(4)-1)+(1)/(x^(2)+sqrt(x^(4)-1))=

If y=[x+sqrt(x^(2)-1)]^(15)+[x-sqrt(x^(2)-1)]^(15) then (x^(2)-1)(d^(2)y)/(dx^(2))+x(dy)/(dx) is eqaul to

If y = tan^(-1)((sqrt(1 + x^2) - sqrt(1 - x^2))/(sqrt(1 + x^2) + sqrt(1 - x^2))) , then show that (dy)/(dx) = x/(sqrt(1 - x^4))

If x=4-sqrt15 find the value of x+1/x