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Q.

if x, y,z are in A.P and tan1x,tan1y and tan1z are also in A.P then

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a

2x=3y=6z

b

x=y=z

c

6x=3y=2z

d

6x=4y=3z

answer is A.

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Detailed Solution

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We know that if x, y,z are in A.P then 
2y=x+zGiven tan1x,tan1y,tan1z are in A.P 2tan1y=tan1x+tan1ztan12y1y2=tan1x+z1xz2y1y2=x+z1xzx+z1y2=x+z1xz(2y=x+z)1y2=1xzy2=zxx,y,z are in G.P since x,y,z are in A.P and also in G.P  thenx=y=z

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