Trigonometric
Derivatives
$\displaystyle \frac{d}{dx} \sin(x) = \cos(x)$
$\displaystyle \frac{d}{dx} \cos(x) = -\sin(x)$
$\displaystyle \frac{d}{dx} \tan(x) = \sec^2(x)\
\qquad\quad \displaystyle \frac{d}{dx} \cot(x) =
-\csc^2(x)$
$\displaystyle \frac{d}{dx} \sec(x) = \sec(x) \tan(x) \quad
\displaystyle \frac{d}{dx} \csc(x) = -\csc(x) \cot(x)$
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