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Home  >>  CBSE XII  >>  Math  >>  Model Papers
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If \( tan^{-1}x+tan^{-1}y=\frac{\pi}{4} \), then write the value of \( x+y+xy\).

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\[Because\:tan^{-1}x+tan^{-1}y=tan^{-1}{\frac{x+y}{1-xy}}\]
answered Feb 13, 2013 by rvidyagovindarajan_1
 

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