$\frac{\sec\left(x\right)-\cos\left(x\right)}{\cos\left(x\right)\sec\left(x\right)}$
$14\:x\:11\:x\:12$
$2x^3+3x$
$\lim_{x\to\infty}\left(\frac{x}{\csc\left(\frac{1}{x}\right)}\right)$
$\frac{dy}{dx}=\frac{y+1}{\:x+3}$
$9z^2+12z+16$
$4+6\cdot3^2$
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