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Q.

If x, y, z are in A.P. and tan-1x, tan-1y and tan-1z are also in A.P. then

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a

2x = 3y = 6z

b

6x = 4y = 3z

c

x = y = z

d

6x = 3y = 2z

answer is A.

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Detailed Solution

x,y,zA.Py-x=z-y tan-1x, tan-1y, tan-1zA.Ptan-1y-tan-1x=tan-1z-tan-1ytan-1y-x1+xy=tan-1z-y1+zy1+xy=1+zy z=x2y=x+z=2z y=zx=y=z

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