Answer
$\cot\theta$ = -$\frac{1}{b}$
Work Step by Step
Given $\cot\theta$ = $-b$ , ($ b\ne 0$)
We know that -
$\tan\theta$ = $\frac{1}{\cot\theta}$
Therefore
$\cot\theta$ = $\frac{1}{-b}$ = -$\frac{1}{b}$ Given ($ b\ne 0$)
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