Find the value of `2- 2/(2+sqrt3)+2/(2-sqrt3)`

Find the value of 2-(2)/(2+sqrt(3))+(2)/(2-sqrt(3))

Find the values of sec^-1( 2/sqrt3)

Find the value of (2 + sqrt(3))/(2 - sqrt(3)) .

Find the value of (2 - sqrt3)/(2 + sqrt3)

Find the value of cos^-1(-sqrt3/2)

Find the value of (1)/(2+sqrt(3))+(1)/(2-sqrt(3))

If sqrt(2) = 1.414, sqrt(3) = 1.732, sqrt(5) = 2.236 and sqrt(6) = 2.449 , find the value of (2+sqrt(3))/(2-sqrt(3)) +(2-sqrt(3))/(2+sqrt(3)) +(sqrt(3) -1)/(sqrt(3) +1)

Find the value of (sqrt2+sqrt3)div(sqrt2-sqrt3) .