Let x1,x2,x3,x4 be four non-zero numbers satisfying the equation tan� – InterviewSolution

1.	Let x1,x2,x3,x4 be four non-zero numbers satisfying the equation tan−1(ax)+tan−1(bx)+tan−1(cx)+tan−1(dx)=π2, then which of the following relation hold(s) good?
Answer» Let $x_{1}, x_{2}, x_{3}, x_{4}$ be four non-zero numbers satisfying the equation $t a n^{- 1} (\frac{a}{x}) + t a n^{- 1} (\frac{b}{x}) + t a n^{- 1} (\frac{c}{x}) + t a n^{- 1} (\frac{d}{x}) = \frac{π}{2},$ then which of the following relation hold(s) good?

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