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

Find the value of tan[cos^(-1) (1/2) + tan^(-1) ( - 1/sqrt3)]

Find the value of tan.[cos^(-1)(1/2)+tan^(-1)(-1/(sqrt(3)))]

Find the value of cos^(-1) ( cos . (2pi)/3) + sin^(-1) ( sin . (2pi)/3) .

Find the value of 2 cos^(-1).(3)/(sqrt13) + cot^(-1).(16)/(63) + (1)/(2) cos^(-1).(7)/(25)

Find the values of : (1) cos^(-1)((1)/(2))+tan^(-1)((1)/sqrt(3)) (2) cos^(-1)((1)/(2))+2sin^(-1) ((1)/(2)) (3) cosec ^(-1)(-sqrt(2))+cot^(-1)(sqrt(3)) .

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

If x in [1, 0) , then find the value of cos^(-1) (2x^(2) - 1) - 2 sin^(-1) x

If x in [-1, 0) then find the value of cos^(-1) (2x^(2) -1) -2 sin^(-1) x

If x in[-1,0], then find the value of cos^(-1)(2x^(2)-1)-2sin^(-1)x

find the value of sin^(-1)(-(1)/(2))+cos^(-1)(-(1)/(2))