$\frac{x^{4-a^4}}{x\cdot a}$
$\int100cos^4\left(20x\right)dx$
$\int8xe^{2x}dx$
$\lim_{x\to0}\left(\frac{cos\left(x^2\right)}{1-sen\left(3x\right)}\right)$
$\left(0.5x-0.7y\right)^2$
$\int2x^2e^{-2x}d^2$
$\frac{1}{-x}-xcos$
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