$\frac{d}{dx}x^4+2y^2=6x^2+4y-5$
$\senx=1+\cos^{2}x$
$\lim_{x\to\infty\:}\left(\frac{x^32^x}{x^23^x}\right)$
$20^2\left(-30-240+20\right)$
$4\cdot49$
$\tan\left(x+y\right)=x+1$
$\left(z+1\right)\left(4z+2\right)$
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