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The least value of (1+sec^(-1)x)(1+cos^(...

The least value of `(1+sec^(-1)x)(1+cos^(-1)x)` is ________

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Verified by Experts

The correct Answer is:
25
Given expression is defined only for `x = 1 and -1`. Therefore,
`f(1) = 1 and f(-1) = (1 + pi) (1 + pi) = (1 + pi)^(2)`
Hence, the least value is 1
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