$\int_{-1}^1\left(\sqrt{\left(4-x^2\right)}\right)dx$
$e^{lnx}=-2020$
$\frac{2x^2}{2x^2-4x+3}$
$\left(2x-y-3z\right)^2$
$\left(x+y+z\right)+\left(2x+2z\right)$
$\int_0^{\frac{\pi}{4}}cos^52x\:dx$
$2r\:2\:+\:2or\:=\:0$
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