tan−1(32)\tan ^{-1}\left(\frac{3}{2}\right)tan−1(23)
tan−1(23)\tan ^{-1}\left(\frac{2}{3}\right)tan−1(32)
sin−1(23)\sin ^{-1}\left(\frac{2}{3}\right)sin−1(32)
cos−1(273)\cos ^{-1}\left(\frac{2}{73}\right)cos−1(732)