$r^{-3}r^4s^{-4}$
$3xdx=4ydy$
$x^4+x^3-5x^2+21x+54$
$x-3x-1$
$\int\frac{\left(x+2\right)}{x^2\sqrt{1-x^2}}dx$
$\int\sec\left(5x\right)^4dx$
$\left(2a^7+3b^6\right)x\left(4a^2b^4\right)$
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