$-8y^4-2y^4$
$\frac{u^2}{u^2+1}$
$x^3y^{3-8}$
$\left(3\right)^2-5\left(3\right)\left(2\right)^3+3\left(2^3\right)^3-\left(2^3\right)$
$xy^2;\:x=3;\:y=-2$
$\int\frac{e^{4x}}{1+3e^{4x}}dx$
$\left(5x^3-2y^2\right)\left(6y^2+5x^3\right)$
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