Find the principal value of each of the following :sec-1(-2) – InterviewSolution

1.

Find the principal value of each of the following :sec-1(-2)

Answer»

\(\sec^{-1}(-2)=\pi-\sec^{-1}(2)\) [ Formula: sec ^-1(-x)= π – sec ^-1(x) ]

\(=\pi-\frac{\pi}{3}=\frac{2\pi}{3}\)

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