$csca-sena=cota$

$\lim_{t\to0}\left(\frac{\left(e^{at}-1\right)}{\sqrt{te}}-e^a\right)$

$\lim_{x\to2}\left(\frac{\sin\left(\pi x\right)}{\left(x-2\right)\left(\cos\left(x\pi\right)\right)}\right)$

$55a\:-\:44a\:=\:11$

$\int\left(\frac{\left(e^{5x}\right)}{e^{5x}-5}\right)dx$

$\frac{dy}{dx}=\left(1+y\right)\left(4+x\right)$

$169-x^2$