$\int e^x\frac{e^{\ln\left(x\right)+x}}{x^2}dx$

$\frac{\sec\left(x\right)-\cos\left(x\right)}{\sec^2\left(x\right)-1}=\cos\left(x\right)$

$\frac{x^2-9}{2x-4}$

$\left(d^9\right)^3$

$\left(2m^5-5q^2\right)^2$

$b+d+b+d+b$

$\lim_{x\to0}\left(\cos\left(\frac{16}{x}\right)\right)^{x^2}$