Please give answer..

Dear student,
The solution is:
tan-1x + tan-1y + tan-1z=π2tan-1x+y1-xy + tan-1z=π2 tan-1x+y1-xy+z1-x+y1-xyz=π2      x+y+z-xyz1-xy-xz-yz=tanπ2x+y+z-xyz1-xy-xz-yz=x+y+z-xyz1-xy-xz-yz = 101-xy-xz-yz=0xy + yz + zx = 1       
Regards

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