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OpenStudy (anonymous):
Find the domain of: (x+sin(x))/(cos(x)) . I'm pretty sure the answer is all real numbers, except for when cosx=0. Cosx=0 when x= 90 degrees and 270 degrees, and multiples of 90 and 270. Therefore, the domain is all real numbers except for 90 degrees, 270 degrees, and their multiples. But how do I write in math: multiples of 90, and multiples of 270?
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OpenStudy (rock_mit182):
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