$x^2-15x+10$

$2x^{\frac{1}{2}}-\left(2y\right)^{\frac{1}{2}}$

$-\sin\left(x\right)^2-2\cos\left(x\right)^2$

$\int\frac{2x^2+x}{\left(x-1\right)\left(x^2+x+1\right)}dx$

$\left(3x^{3\:}-5\right)^2$

$\ln\left(3\right)+\ln\left(x^2-6\right)=\ln\left(3x\right)$

$\frac{2x-7x^3+3x-2}{x^2-2x+1}$