Noon Academy
and
Vinay
3 years ago
replacing x by
and y by
, we get,
![\tan \frac{1}{2}\left[\sin ^{-1} \frac{2 \tan \theta}{1+\tan ^{2} \theta}+\cos ^{-1} \frac{1-\tan ^{2} \phi}{1+\tan ^{2} \phi}\right]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-e4342cf376c97c6376a4bbb59e7bff2d_l3.png "Rendered by QuickLaTeX.com")
![\tan \frac{1}{2}\left[\sin ^{-1} \frac{2 x}{1+x^{2}}+\cos ^{-1} \frac{1-y^{2}}{1+y^{2}}\right],|x|<1, y>0](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-a3d0089ff967a11fe8c59df47e80a07a_l3.png "Rendered by QuickLaTeX.com")
