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Q.

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

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a

x=y=z

b

2x=3y=6x

c

6x=3y=2z

d

6x=4y=3z

answer is A.

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Detailed Solution

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2Tan1 y=Tan-1 x+Tan-1 z tan12y1y2=tan1x+z1xz 2y1y2=x+z1xz     since 2y=x+z y2=xz x,y,z are in G.P as well as in A.P

x=y=z

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