Teaching Haryana (HPSC) PGT Mock Test 2024 Mathematics Trigonometry Inverse Trigonometric Functions

यदि \(\rm \cot\left[\tan^{-1}{a} - \tan^{-1}{\left({x-y\over x+y}\right)}\right] = 1\) है, तो निम्न में से क्या सही है?

1
a = \(\rm y\over x\)
2
a = \(\rm x\over y\)
3
a = \(\rm x-y\over x\)
4
a = \(\rm x+y\over x-y\)
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