<p>try to make a song out of it. this may sound funny, but it actually works. in bc our math teacher makes us stand up and chant this song.</p>
<p>the derivative of sin is cooooosin and the derivative of the cosine is the negative sin. </p>
<p>tan sec squared! tan sec squared! the derivative of the tangent is the secant squared!</p>
<p>sec sec tan! sec sec tan! the derivative of the secant is the secant tan!</p>
<p>(referring to cot and csc) All derivatives of cofunctions start with a negative and they all start with co- co-!</p>
<p>hope this helps!</p>