$\frac{dy}{dx}=\frac{3-x}{2e^{y}}$
$a\frac{1}{2}b^2+a\frac{1}{2}b^6$
$3\left(x-y\right)\left(x+y\right)^4-243\left(x-y\right)$
$2x^3+21x^2$
$12x^2+20xy$
$4\cos^2x=3-4\cos x$
$-2\left(x-1\right)=4$
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