Find the values of the following: tan-1(1) + cos-1(-1/2) +sin-1(-1/2)

Find the values of the following: tan^-1(1) + cos^-1(-1/2) +sin^-1(-1/2)
Answer

Find the values of the following: tan^-1(1) + cos^-1(-1/2) +sin^-1(-1/2)