Trigonometry
posted by Rob .
What is cos (pi/2  x) secx using the fundamental identities to simplify the expression. I think I have the right answer but I want to check to make sure.
Well, cos (pi/2  x) is something you should've seen already. It's just another name for sin(x). Also, sec(x) is the same as 1/cos(x). Can you take it from here?
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