$y=\mathrm{sech}\:^{-1}\left(cosx\right)+\ln\:\left(\mathrm{sech}\:\left(2x\right)\right)$
$-\left(a-b\right).\left(b-a\right)$
$\left(3-2y\right)^2$
$\left(6x+1\right)^3$
$-12+\left(-12+4\right)$
$y'=\frac{1}{xseny+2sen2y}$
$\lim_{x\to\infty}\left(\frac{20x}{20x+9}\right)^{8x}$
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