$\ \left(2x^4+6x^3-5x^2-27x-18\right)$

$\int\frac{x+5}{\left(x+3\right)^2+1}dx$

$\log\left(2x-6\right)+\log\left(x+2\right)=2$

$\lim_{x\to4}\left(\frac{3x^2-17x+20}{4x^2+25x+36}\right)$

$\int e^{xy}dy$

$\left(x^2+2y^4\right)^3$

$\left(-18\right).\left(12\right):\left(4\right).\left(5\right):\left(10\right)$