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Fill in the blanks choosing correct answer from the brackets.
If `x+y=4,xy=1`, then `"tan"^(-1)x+"tan"^(-1)y=` …. .
`((3pi)/(4),pi/(4),pi/(2))`

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The correct Answer is:
`=pi/(2)`
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ARIHANT PUBLICATION-INVERSE TRIGONOMETRIC FUNCTIONS -ODISHA BUREAU.S TEXTBOOK SOLUTIONS
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