$\frac{a^7}{a^{14}}$

$\left(y\:lnx\right)^{-1}\:\:\frac{dy}{dx}=\left(\frac{x}{y+1}\right)^2$

$\int\left(\frac{x^2}{\left(169-x^2\right)^{\frac{3}{2}}}\right)dx$

$-6\cdot\left(-2\right)\cdot\left(-3\right)+78$

$\left(5x+3\right)\cdot4\le\left(3x+1\right)\cdot2$

$7-3^2+4$

$x^3+4x^2-3x-2$