$\left(n^2-2\right)^2$
$\frac{-2x}{x}$
$100ab^2c-500b^8c^2d$
$3secx-tanx$
$\int_{-1}^1x\cdot0.75\left(1-x^2\right)dx$
$15-1600$
$\lim_{x\to0}\left(\frac{e^x-x-cos\left(x\right)}{[sen\left(x\right)]^2}\right)$
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