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If "tan"^(-1)x+"tan"^(-1)y=pi/4,xylt1, ...

If `"tan"^(-1)x+"tan"^(-1)y=pi/4,xylt1`,
then write the value of `x+y+xy`.

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SHARAM PUBLICATION-INVERSE TRIGNOMETRIC FUNCTIONS-EXAMPLE
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  10. Evaluate tan^(-1)(1)+cos^(-1)((-1)/(2)).

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  17. if xy+yz+zx=1 then what is tan^(-1)x+tan^(-1)y+tan^(-1)z?

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