Find the principal value of inverse function in radian

:\( Cos^{-1}(\frac{1}{√2})\)

Adv.

\(N= 9^9 \) the N is devisible by how many positive perfect cube.

Find the principal value

\(Cos^{-1} [\frac {-√3}{2}]\)

Find the principal value :

\(Tan^{-1}[\frac {-1}{√3}]\)

\(Cot^{-1}(\frac{-1}{√3})\)

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