$ysecx=\frac{dy}{dx}$
$\lim_{x\to1}\left(\frac{x^2+8x+9}{lnx}\right)$
$\lim_{t\to-7}\left(\frac{t^2+4t-21}{t-7}\right)$
$-x+y+xy'=0$
$\left(x^7+1\right)^4$
$\left(-3\right)x\:\left|-3-\left(-7\right)\right|-\left(-4\right)$
$\left(6-y^2\right)^2$
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