<p>Repetition is the key to remembering the derivatives. Keep on working on problems involving these derivatives to get them in your brain. In time, you’ll be writing it in your sleep. :P</p>
<p>One way of recalling the values of trig. derivatives is to remember all the ones that start with c are NEGATIVE. Another thing to remember is that cot and tan are related respectively to csc and sec. As you can see cot and csc both start with c, so that is another way to remember.</p>
<p>Really, it is up to you to figure out how you want to memorize it. ;)</p>