$\frac{d}{dx}3^{\sec\left(2x+1\right)}$
$\lim_{x\to-a}\left(\frac{x^2-a^2}{x\left(x+a\right)}\right)$
$\int_0^4exdx$
$2\cos\:x+\sqrt{2}=0$
$y'=2x+y$
$\int\frac{\sec^2\left(x\right)}{4+\tan^2\left(x\right)}dx$
$cos\left(2x\right)=\frac{4}{5}$
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