$4\left(x\right)-2\left(x\right)^2-1$
$\lim_{x\to\infty}\left(\frac{3x+2}{4x^3+6}\right)$
$-4\cdot81-9\cdot1$
$x^2-4x+-4$
$\lim_{x\to0}xcos\left(x\right)$
$\int\frac{2x-36}{\left(x-3\right)\left(x-40\right)}dx$
$\frac{2a^4b^5}{5a^6b^3}2$
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