$\left(2a^{x-1}\right)^2$

$\frac{\left(-3\right).\left(+8\right)+\left(-5\right).\left(+3\right)}{\left(13\right)}$

$\frac{x^3y^2+2x^2y}{2x^2y^2}$

$\:\frac{\left(-49\right)}{7}\cdot\left(-1\right)$

$\lim_{n\to\infty}\left(\frac{1}{e^{\frac{4}{n}}+\frac{1}{n^2}}\right)^n$

$\int3\sec^{2}\thetad\theta$

$\int6y\:dx$