$\left(-18x^4-13x^3+15x^2+7x-6\right)+\left(15x^3+13x^2+10x-7\right)$

$\left(3x+4\right)\left(x^2-x-42\right)=0$

$\left(\frac{\sqrt{x\sqrt{x\sqrt{x}}}}{\sqrt{x\sqrt[4]{x}}}\right)^8$

$x^2+8x+216$

$\frac{125-x^3}{5+x}$

$\frac{dy}{dx}\left(\left(5x-9\right)^5\right)$

$sin^2\left(x\right)+\frac{1}{2}+cos\left(2x\right)=1$