If cot^(-1)x+cot^(-1)y+cot^(-1)z=pi/2,x ...

If `cot^(-1)x+cot^(-1)y+cot^(-1)z=pi/2,x , y , z >0a n dx y<1,` then `x+y+z` is also equal to `1/x+1/y+1/z` (b) `x y z` `x y+y z+z x` (d) none of these

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If cot^(-1)x+cot^(-1)y+cot^(-1)z=(pi)/(2),x,y,z>0 and xy<1 then x+y+z is also equal to (1)/(x)+(1)/(y)+(1)/(z)(b)xyzxy+yz+zx(d) none of these

If cot^(-1)x+cot^(-1)y+cot^(-1)z=pi/2 , then x + y + z = _____

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If cot^(-1)x-cot^(-1)y=0andcos^(-1)x+cos^(-1)y=pi/2 then x + y = _______