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What is the value of $tan^{-1}x+tan^{-1}y$ given $xy <1$?

related to an answer for: What is the value of $cos^{-1}x-cos^{-1}y$
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Answer: $tan^{-1}\frac{x+y}{1-xy}$
answered Mar 12, 2013 by balaji.thirumalai
 
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