$\int_1^4\left(5-2t+3t^2\right)dx$
$\sqrt{80}\cdot\sqrt{90}$
$3v+5-9$
$20+90+51\cdot$
$\frac{dy}{dx}y=\left(x^2\:+\:7\:x\:+2\right)\left(2\:x^2\:+4\right)$
$z^4\:+\:3z^2\:+\:4$
$k-k$
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