Find the break even points of the expression $\frac{3}{4}x\cos\left(x\right)\sin\left(x\right)\cos\left(x\right)-\sqrt{24\cdot \left(\frac{3}{4}\right)x\sin\left(x\right)}+13=x-\frac{3}{4}\sin\left(x\right)^3$

$classify\left(x^2-x^3+1-1\cdot 4\cdot x\right)$

$classify\left(x^2+1-1\cdot 4\cdot x\right)$

$classify\left(x^2-x^3-1\cdot 4\cdot x\right)$

$classify\left(3m^2-2m\cdot n+5n^2\right)$

$classify\left(x^2+1-4\cdot x\right)$

$classify\left(x^2-4\cdot x\right)$

$classify\left(-x^3\cdot y\right)$