$x^2+7x-6=0$

$3\cdot0^4-5\cdot0^2-1$

$\left(2.04\right)\cdot\left(-30.6\right)$

$\frac{dy}{dx}=-\frac{y}{2}$

$y'\:-\tan\left(x\right)\cdot y=x\cdot\sec\left(x\right);\:y\left(0\right)=3$

$y=x^2-x^{-1}$

$\frac{5}{6}\cdot\left(1-x\right)>\frac{1}{3}\cdot\left(x-1\right)-x$