1. Find the principal value of sec^-1 (-2/√3) 2. if sin(sin^-1)(1/5) + cos^-1(x)) = 1 then find the value of x.

Question

1. Find the principal value of sec^-1 \((-\frac{2}{\sqrt3})\)

2. if sin (\(sin^{-1}{\frac{1}{5} + cos^-1(x)}) = 1\), Then find the value of x.

Answer 1

1. principal value of:

2. find the value of x: