Differential Equations

$\cos x=\mathrm{c} \operatorname{cosec} y$, where c is the constant of integration.

$\sin x=\mathrm{c} \sec y$, where c is the constant of integration.

$\sin x=x \cos y$, where c is the constant of integration.

$\cos x=\mathrm{c} \sin y$, where c is the constant of integration.