$6\left(55\right)$

$\frac{-8000\ln\left(0+25\right)-8000}{0+25}+c$

$\frac{dy}{dx}\left(y=\frac{x^{-4}}{4}-\frac{7}{6}x^{-3}+x^{-2}-5x^{-1}-7\right)$

$\left(-5c^2+3\right)^3$

$\left(1-\csc^2\right)\tan^2$

$\ln\left(x+e^{2x}\right)-\ln\left(a+e^{4x}\right)$

$a\cdot3^3$