$\frac{x}{\sqrt{a^2-x^2}}$

$\lim_{x\to3}\left(\frac{x+1}{x^2-3x-4}\right)$

$\left(4-3y\right)\left(4+3y\right)$

$\frac{sinx+sinxtan^2x}{sec^2x}$

$\lim_{x\to0}\left(\frac{e^x}{\ln\left(2x+1\right)}\right)$

$x^3+3x^2+3x+1$

$4\left(x-5\right)-\left(4x-6\right)+3\left(5x-1\right)>\left(14x-8\right)-2\left(3x-4\right)$