$\quad \log \left(\cos x+\sqrt{\cos ^2 x+5}\right)+\mathrm{c}$, where c is the constant of integration

$\quad \log \left(\sin x+\sqrt{6 \cos ^2 x+5}\right)+\mathrm{c}$, where c is the constant of integration

$-\log \left(\cos x+\sqrt{\cos ^2 x+6}\right)+\mathrm{c}$, where c is the constant of integration

$-\log \left(\cos x+\sqrt{\cos ^2 x+5}\right)+\mathrm{c}$, where c is the constant of integration