$1+1-1-1\cdot1+1-1-1\cdot1$
$\frac{d}{dx}3x^2+2xy^2=y$
$sinx\left(sinx-cosx\right)=0$
$\lim_{x\to-\frac{\pi}{3}}\left(\frac{cos\left(x\right)-\frac{1}{2}}{x-\frac{\pi}{3}}\right)$
$\frac{dr}{dx}=rx+r+x+1$
$-8\left(-4+9d\right)$
$\left(4x+3\right).\left(4x-3\right)$
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