$\frac{dy}{dx}\left(ylnx+2=xy\right)$
$1-ctgx=\sqrt{csc^2x-2ctgx}$
$\left(1+cos^2x\right)^2$
$\left(2a+4\right)\left(2a-2\right)$
$4b-24+19$
$\ln\left(x+7\right)=\ln\left(x-9\right)-\ln\left(x+9\right)$
$2x^2+13x+20=0$
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