More specifically, how would you write $\csc(-2\pi/5)$ as the trigonometric function of a positive number?
How do you write the cosecant function of a negative number as the trigonometric function of a positive number?
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trigonometry
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0Just to clarify what Chaz is saying, $\sin(-x) = -\sin x$ from where the same holds for the cosecant. – 2012-04-25
1 Answers
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Hint: Recall that $\sin(x)=\sin(x+2k\pi)$ for any integer $k$. Let $x=-2\pi/5$ and let $k=1$.
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0This might be more in line with the *desired* solution than my comment above, but who knows! *"This answer is useful"* – 2012-04-25