$2y\left(9x+2y\right)$
$\lim_{x\to0}\left(\frac{sin21x}{x^2}\right)$
$\left(-100\right)+\left\{\left[\left(678\right)-\left(276\right)+9\right]\right\}$
$2\frac{dy}{dx}=y\left(y-1\right)\left(y+1\right)$
$\int\sqrt[5]{7-4x^3}x^2dx$
$2b^2+17b+21$
$x^2dx+2ydy=0$
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