i am very much thankful to the one who show quick solution for DE of TanX*TanY=C?
If I undestand correctly You require the DE the solution of which is, in implicit form,...
(1)
In that case we first separe the variables...
(2)
...then compute the logarithm of both sides of (2)...
(3)
... then differenziate both sides of (3)...
(4)
... and finally we obtain...
(5)
Kind regards