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यदि `tan^(-1)x +tan^(-1)y=(pi)/(2)` तो सिद्ध कीजिए कि `xy=1 ` |
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Answer» `tan^(-1)x+tan^(-1)y=(pi)/(2)` `implies tan^(-1)""[(1+y)/(1-xy)]=(pi)/(2)` `implies (x+y)/(1-xy)=tan""(pi)/(2)=oo=(1)/(0)` `implies 1-xy=0` `implies xy=1 ` |
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