Find the principal value of
- find the principal value of cos-1(u221A3/2)
- find the principal value of sin-1(u221A3/2)
- find the principal value of tan-1(-u221A3)
- find the principal value of cos^-1(-1/2)
- find the principal value of cosec inverse 2
- find the principal value of tan-1(-1)
- find the principal value of sin-1(1/u221A2)
- find the principal value of cot inverse 3
- find the principal value of cot^-1(-1/u221A3)
- find the principal value of sin-1(-1/2)
