I am doing a trigonometric derivative problem, but I think I have forgotten the right step of when to add a or when to add a 2 . For example in my book, one of the problem says cosx = x = or . Now at other problem I see it says tanx = 1 x = (n is an integer). Can you give me an explanation? Thank you for the help.
linking trig functions with the unit circle is the best way to get a feel for them in the early going. they are defined by the ratio of the sides one can inscribe therein, where the sides are those of a right triangle. if you study the geometry for a little while, it'll be like riding a bike thereafter.