$\left(-2a^2b^3c^4\right).\left(3a^3b^2c^3\right)$

$\int\left(\frac{tan^{-1}\left(9x\right)}{1+81x^2}\right)dx$

$a^2+50a+255$

$\left(-2xy\right)\left(-2xy\right)$

$\int_0^{\frac{\pi}{2}}\:\:\left(2e^{2x}\right)\sin\left(5x\right)dx$

$\left|\left(-4+9-1\right)\cdot\left(-1-2\right)\right|-\left|-\left(-5\right)+\left(-7\right)\right|\cdot4$

$\int_0^{10}\left(arctan\left(x\right)\right)dx$