$-2x\left(3^{x^2}-4\right)$

$\int\left(5\cos\left(x\right)\left(4+\sin\left(x\right)\right)^4\right)dx$

$y'+\left(x+2\right)y=0$

$2k^2+k-7=0$

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

$\lim_{x\to\infty}\left(\frac{6^{2x}}{e^{2x}}\right)$

$\frac{a^7+128}{a+2}$