$x^2+6x+c=13+c$

$\int_2^4\frac{5}{x^2-6x}dx$

$sec=\frac{29}{20}$

$-27-54$

$\lim_{x\to\frac{\pi}{4}}\left(\frac{cos\left(2x\right)}{\cos\left(x\right)-\sin\left(x\right)}\right)$

$\frac{dy}{dx}+5y=10e^{-4x}$

$\lim_{x\to2}\left\{\frac{x^2-4}{\sqrt{3x-2}\sqrt{x+2}}\right\}$