$42\cdot6$
$x^4-\left(y-1\right)^4$
$\frac{\left(10x^3-15x+20x^4\right)}{\left(-5x^2\right)}$
$\left(x^2-2y\right)\left(x^2-4xy+y^2\right)$
$\int x^2arc\cdot\cos\left(x\right)dx$
$x^2+4x+25$
$\frac{d}{dx}\left(x\right)=-6\sin\left(x\right)-3x$
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