解答
$\csc(\theta) = \frac{1}{\sin(\theta)}$, $\sec(\theta) = \frac{1}{\cos(\theta)}$, $\cot(\theta) = \frac{1}{\tan(\theta)} = \frac{\cos(\theta)}{\sin(\theta)}$.
解説
Remember the SOH CAH TOA framework extended to their reciprocals.
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What are the trigonometric reciprocal identities for $\csc(\theta)$, $\sec(\theta)$, and $\cot(\theta)$?
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