$\left(sen\:\theta\:\right)\left(sec\:\theta\:\right)=\left(tan\:\theta\:\right)$
$20x^2+29x+5$
$\frac{-c}{a}+\frac{b^2}{4a^2}$
$\lim_{x\to-\infty}\left(\frac{e^x}{x}\right)$
$\cos\left(90-x\right)$
$2x+12+8x+6+5x$
$7cos\left(2x\right)=-21cos\left(x\right)-14$
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