$\sqrt{4x}+\sqrt{x}$

$9x^2y+3x^2y$

$\int c^3\arctan\left(c\right)dc$

$\int1\frac{1}{\sqrt{16+x^2}x^2}dx$

$\int\:4xarccos\left(x^2\right)dx$

$\int\left(sin\left(ln\left(13x\right)\right)\right)dx$

$\left(\left(-2\right)^3\right)^4\cdot\left(2^2\right)^3\cdot\left(\left(-3\right)^4\right)^3$