$\cos^2\left(x\right)+5\cos\left(x\right)+2=0$
$\left(+8\right)-\left(7.6\right)$
$6x^2-23x+21$
$3>x+2$
$\cos^4\left(x\right)=\frac{1-\sin^2\left(x\right)}{\sec^2\left(x\right)}$
$\frac{dy}{dx}+2y=e^{3x},y\left(0\right)=3$
$\frac{x^2}{x-1}=0$
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