$a^2+i^2=a$
$\lim_{x\to0}\left(x\cdot in\left(x\right)\right)$
$\frac{-144\:a^{15}b^{10}c^5d}{12a^3b^6c^4}$
$\left(-148\right)+\left(-315+\right)\left(-218\right)$
$\frac{x^2-6x+2}{x-3}$
$\frac{1}{cosa}$
$k^2+11k^230$
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