$f\left(x\right)=5.\left(x+1\right)\left(x^2+x-2\right)$
$65=\left(x-4\right)^2+16$
$\frac{d}{dx}\left(\csc\left(8x+2\right)\right)$
$y'+2y=3e^t$
$\frac{8x^2+4x-7}{x^2+1}$
$-5k^3\:x\:-2k$
$5x^2+2x+4xy-3x^2-7x+3y$
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