$7\cos\left(x\right)+9=-2\cos\left(x\right)$
$xy^2-x=3$
$2x-8+x^2-1+2x-8+x^2$
$\frac{\left(\cos\:\left(x\right)\sin\:\left(x\right)\right)}{\cos\left(45\right)\sin\left(45\right)}$
$y^'=\:y-y^2$
$-2,21+0,4$
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