Wb Jee
Inverse Trigonometric Functions
WB JEE 2009
MCQ+1 / -0.252009
\(\tan \left[ {{\pi \over 4} + {1 \over 2}{{\cos }^{ - 1}}\left( {{a \over b}} \right)} \right] + \tan \left[ {{\pi \over 4} - {1 \over 2}{{\cos }^{ - 1}}\left( {{a \over b}} \right)} \right]\) is equal to