trigonometry - Proving that $\tan \theta=\cot(90^\circ-\theta
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I'm asked to prove $\tan \theta=\cot (90-\theta)$ So $\tan \theta =\frac{a}{b}=\cot(90^\circ-\theta)$ But what if $\theta>90?$
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How do you tell whether the value of tan 90 degrees is positive, negative, zero or undefined?
c# - Why does Math.Tan(90) provide a non-undefined value? - Stack Overflow
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