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" (8) "tan^(-1)14+tan^(-1)y+tan^(-1)2=pi...

" (8) "tan^(-1)14+tan^(-1)y+tan^(-1)2=pi/2

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If tan^(-1)x +tan^(-1) y +tan^(-1) z=pi/2 . Show that xy+yz+zx =1.

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