$6+4+9-12-2-6\cdot4$

$+30a^2b^1-30a^2b^1$

$\int12x^2\left(x^3-7\right)^5dx$

$abc^2a+abc^2a$

$\left(6\sin\left(x\right)+6\cos\left(x\right)\right)^2$

$\left(a^{-3}b^4c^3\right)^{11}$

$\lim_{x\to\infty}\left(\frac{x+2}{\sqrt{x+3}-1}\right)$