$-4x+9y=18$
$x6-1000$
$\left(3x-1\right)\left(-3x-1\right)$
$\int36x^8e^{-x^9}dx$
$4y-12+8y^2$
$\frac{dy}{dt}+y\cdot cos\:t=0$
$\frac{1}{cot^2}x-sec^2x$
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