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Ok, this is not really a problem, but I need help on understanding the basics of sin, cos, tan, and their inverses.

i was looking at http://www.analyzemath.com/DomainRange/domain_range_functions.html and it was saying that the domain for sin and cos is (-inf , + inf)

and then for tan it is All real numbers

except pi/1 + n*Pi

but then for csc, it is All real numbers

except n*Pi

Can you explain why? I think I'm having trouble with figuring out how to find domains and I want to understand this before I start calculus. Please explain.

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# Need help with determing domains of sin, cos, and tan

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