
What about graphing the cosinus? How do you think it is different from the sine? Check your guess below.
It looks about the same, doesn't it? It's the same curve, moved to the left by π/2. Now that you have seen the sine and cosine only the tangent and the cotangent are left to look at. How do you think they look? The graphs of the tangent and cotangent functions must look kind of similar since one is the inversion of the other one; and they have to look different from the graphs of the sine and the cosine functions because they are not defined through their hypotenuse. And here we have the cotangent:



