$-4x^3y-4xy^3+5;\:x=2;\:y=-1$
$3x^2-4x+1^35$
$e=cos\:\left(x+y\right)$
$y=\sqrt[3]{\frac{x+1}{x-1}}$
$\left(3x+9\right)\left(x-5\right)\le0$
$15\cdot13$
$y\left(\frac{dx}{dy}\right)-x=2xy^2$
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