$\left(4x^4-18x^2y\right)$
$3,025+0,21$
$\int\left(7x^2+4\right)e^{2x}dx$
$\int_0^{2\pi}\left(\frac{x^2}{\sqrt{x^2+r^2}}\right)dx$
$\int s^2e^{-st}dx$
$3x^2-2x-2=0$
$tan\:cot\:=1$
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