$\frac{x^5+12}{x^2+x+2}$

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

$\ln\left(11\right)+\ln\left(x^2+\frac{10x}{11}\right)=0$

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

$12^5y^2+9x^4y+6x^3y^2$

$\left(4x+15\right)^2$

$\left(1-\sec\left(x\right)\right)\left(1-\cos\left(x\right)\right)$