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OpenStudy (anonymous):
Medal & fan Which function has a domain of all real numbers except x=pi/2-(n)pi? A. y=1/sin x B. y=sec x C. Y= cot x D. Y= cos x And why? Thanks!!!
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OpenStudy (anonymous):
cos (pi/2)=0 so sec=1/cos= 1/0 infinite
OpenStudy (anonymous):
B is the answer
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