$\lim_{x\to0.001}\left(\frac{sen2x}{x}\right)$
$\left(x^{-2}+x^{-3}\right)\left(x^5-3x^2\right)$
$7w-w$
$\frac{1-\sec^2\left(\theta\right)}{\sec\left(\theta\right)}$
$2sin^2x-1=cos^4x-sin^4x$
$\lim_{x\to\infty}\:3x^5-3x^3$
$x\cdot y'+y=3$
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