$15+6+4-8-9+18$
$\left(2.1\right)y^{\prime}=8+2x-3x^{2}$
$\frac{d}{dx}\:x^4+2x^2y^2=a^4$
$-3x\:+\:2y\:+z\:=\:1$
$\frac{\left(2x+3\right)^3}{x^2}$
$3x^2-10x+12$
$\cos^2x-2\cos x=3$
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