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eleventhxhour

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5a) \(\displaystyle \frac{sinx}{tanx} = cosx\)

I did the first part of the question correctly (proving it), but I don't understand how you determine the restrictions on the variables. In the textbook, it says that it cannot be 0°, 90°, 180°, 270°, and 360°. Could someone explain how they got that?

Thanks!