$-a\left(a+b\right)$

$y^{\left(8\right)}-2y^{\left(4\right)}2^{\left(3\right)}+2^{\left(6\right)}$

$350-\left(7-2+5\right)-\left(6+3\right)+\left(9+8-2\right)$

$\sqrt{x^2+y^2}=e\arctan\left(1\right)^{\frac{y}{x}}$

$\frac{a}{b}+1$

$\frac{dy}{dx}=\frac{y^{3}}{x^{2}}$

$18x-6x^2+12=-420$