$-\left(x^2+3\right)^2$
$-3x^2ym+7x-ymx^2+16x$
$\left(1-e^{-x}\right)^4$
$\frac{1+\sin\left(x\right)}{\cos^2\left(x\right)}$
$\lim_{x\to0}\left(\frac{6x}{ln\left(1-x\right)}\right)$
$\frac{x^3-4x^2+7x+1}{x^2-3x-9}$
$\int-4\sin\left(x^2\right)dx$
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