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itspaula_hoe
Feb 15, 2013, 02:49 AM
sec^2xcotx-cotx+tanx ? Verify id

ebaines
Feb 15, 2013, 07:25 AM
You forgot an equals sign. I think what you mean is:

sec^2xcotx = cotx+tanx

As usual for these types of prioblems, start by replacing the sec, tan, and cot functions with their sin and cos equivalents, and then simplify. This one works right out - the only trick is to remember that cos^2x + sin^2x = 1.