$\lim_{x\to0}\frac{15x^3}{sin\left(x\right)-x}$
$100\left(1-e^{-.2t}\right)$
$\left(\sin\left(x\right)-\cos\left(x\right)\right)^2+2$
$2\:\left(x+3\right)-x$
$g^2+22g+21$
$4x^2\:+\:4k^3+\:5x^2\:-\:2k^3$
$\int x\cdot e^{-4t}dx$
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