$\sqrt{64-15-2\cdot3^2}$
$2\cos^2\left(x\right)-6\sin^2\left(x\right)=0$
$5h-6-8+7h$
$x^2+3y^2=4$
$18.3\cdot5.1$
$3x-y-6=0$
$\frac{dy}{dx}=2x+7y$
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