$\frac{7^{7^x}}{(\log 7)^3}+\mathrm{k}$, where k is constant of integration

$\frac{7^{7^{7^x}}}{\log 7}+\mathrm{k}$, where k is constant of integration

$\frac{7^{7^{7^x}}}{(\log 7)^3}+\mathrm{k}$, where k is constant of integration

$7^{7^{7^x}}(\log 7)^3+\mathrm{k}$, where k is constant of integration

$\log \sec (9 x)-\log \sec (2 x)+\mathrm{c}$, where c is the constant of integration

$\log \sec (9 x)+\log \sec (2 x)+\mathrm{c}$, where c is the constant of integration

$\frac{1}{9} \log \sec (9 x)-\frac{1}{2} \log \sec (2 x)+\mathrm{c}$, where c is the constant of integration

$\frac{1}{9} \log \sec (9 x)+\frac{1}{2} \log \sec (2 x)+\mathrm{c}$, where c is the constant of integration

$x=\log (x+y+2)+\mathrm{c}$, where c is the constant of integration

$x=\log (x+y-2)+\mathrm{c}$, where c is the constant of integration

$y=\log (x+y+2)+c$, where $c$ is the constant of integration

$y=\log (x+y-2)+\mathrm{c}$, where c is the constant of integration