defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Trigonometry Inverse Trigonometric Functions

If tan^-1 x + tan^-1 \(y = \frac{\pi }{4}\), then

1

x + y + xy = 1

2

x + y - xy = 1

3

x + y + xy + 1 = 0

4

x + y - xy + 1 = 0

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