Verifying Trigonometric Identities
I'm a bit confused on verifying trigonometric identities. An example problem would be:
$\displaystyle \cos(\frac{\pi}{2})-\Theta=\sin\Theta$
Or:
$\displaystyle \cot(\pi+\Theta)=\cot\Theta$
Can someone please explain what exactly the question is asking, and how I find the solution? Thanks.
Also, is there any way to visually differ between the graph of a sine function and the graph of a cosine function, if you don't know if one may be shifted? Sorry if that is hard to understand.