Question
If $\cot (90-A)=1$, then $\angle A=$ ?
✓
Answer
$\cot (90-A)=1 \quad \ldots .\text {[Given]}$
$\therefore \tan A=1$
$\therefore A=45^{\circ} \quad \ldots \ldots\left[\because \tan 45^{\circ}=1\right]$
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