engineering recuitment NCRTC Station Controller Mock Test 2021 Mathematics Trigonometry Inverse Trigonometric Functions
\({\cot ^{ - 1}}\left( {\frac{4}{5}} \right) + {\cot ^{ - 1}}\left( { - \frac{4}{5}} \right)\) का मान ज्ञात कीजिए।
1
0
2
4/5
3
π
4
π/2