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Use of Trigonometric Table

Evaluate: -1...

Question

Evaluate: ${cot}^{- 1} (- 1)$

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Solution

$cot \frac{3 π}{4} = - 1$
$\Rightarrow {cot}^{- 1} (- 1) = \frac{3 π}{4}$ since $\frac{3 π}{4} \in$ Range of ${cot}^{- 1} x$

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