$9x^2y+6xy-7x^2y-9xy$
$y-x+xy\cot\left(x\right)+x\frac{dy}{dx}=0$
$\lim\:_{x\to\:\:0}\left(\frac{\sqrt{2+x}+\sqrt{2}}{x}\right)$
$y=\ln\left(\frac{x\cdot sin\left(x\right)}{\sqrt{x^2+11}}\right)$
$\frac{dx}{dt}=tx+t+x+1$
$4x^2-22x+121$
$6x+3+\left(-5x\right)+9$
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