$x-5=13$

$-\tan\left(2\right)^2$

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

$169x^2+260xy+100y^2$

$\frac{dy}{dx}=\frac{x\left(y^3+y\right)}{3y^2+1}$

$\left(27+\frac{9}{x}\right)^{\frac{1}{3}}$

$\left(6y^2+5bx^3\right)\cdot\left(36y^4-30bx^6y^2+25x^6b^2\right)$