$sin\left(\frac{2\pi}{3}-\frac{3\pi}{4}\right)=sinucosv-cosusinv$
$\left(x^2-4\right)\left(3-2x\right)$
$7\left(x-7\right)$
$-6x+7\le2+13x$
$y+e^xsinx=x^3y'$
$\left(-90\right)-\left(-80\right)-\left(-10\right)$
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