\
The equation is
\
Hyperbolic definition for tangent is
\
Substitute
in above equation.
\
\
\
\
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ea1dac3b557376e2c65baa6b5d449753.png\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4315a32250aa994ed54ceb42a3728056.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=113d2f1039b732e99e0a13cd64c7a26c.png\")
in above equation.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c32e85c24cd30cd374e2d8ba2cacc8a3.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7ab3cfd46a59156b683141c241a32060.png\")
![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7ab3cfd46a59156b683141c241a32060.png\")