$-x^2y^2+2xy^3$
$sin\left(4x\right)sin\left(5x\right)+cos\left(4x\right)cos\left(5x\right)$
$\lim_{x\to0}\left(\frac{1}{x}-\frac{cos\:x}{sen\:x}\right)$
$\lim_{x\to0}\left(\frac{\left(\sqrt{1+4x}-\sqrt{1-8x}\right)}{x}\right)$
$3\left(4x\right)\left(-y^2\right)^2$
$\int\left(\frac{x^3-8}{x-2}\right)dx$
$x^{-5}x^3$
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