$\int-2xdx$
$\int log\:x^2dx$
$x^2\:+\:x\:1$
$-5+x^4=2x^2-3x^3+3x\:+x^3-3x^2-5$
$4x^2+168x-540=0$
$\lim_{x\to0}\left(\frac{2e^x-4cos\left(x\right)+e^{-x}}{xsen\left(x\right)}\right)$
$\left(2x+3b^2\right)^4$
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