inv-trig

Question: 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) $x+y-xy+1=0$
Solution: Explanation: No Explanation
Inverse trigonometric functions

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