$5-\left(3-\left(\left(4-7\right)-5+\left(4-2\right)\right)-6\right)+3$

$arctan\left(tan\left(\frac{56}{45}\pi\right)\right)$

$\left(4.5a+3.3b-1.2\right)+\left(-2.5a+2b+5.3\right)$

$5^4y^3z$

$\frac{x-9x\sqrt{x}}{\sqrt{x}}$

$\frac{du}{dx}=\frac{1}{\left(u-x\right)}$

$4m^2+20am$