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Find the principal value of sec-1(-1) |
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Answer» We know that the principal value branch of cos–1x & sec–1x is [0, π]. Now, sec–1(–1) = sec–1(secπ) (\(\because\) secπ \(=\frac{1}{\cos\pi}=\frac{1}{-1}=-1\)) = π \(\therefore\) The principal value of sec–1(–1) is π. |
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