If $x, y, z$ are in $A.P.$ and $\tan^{-1} x, \tan^{-1} y, \tan^{-1} z$ are also in another $A.P.$,then:

  • A
    $x = y = z$
  • B
    $x = y = -z$
  • C
    $x = 1, y = 2, z = 3$
  • D
    $x = 2, y = 4, z = 6$

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$(C)$ If $a=1$ and $b=2$,then $(x, y)$ $(r)$ lies on $y=x$
$(D)$ If $a=2$ and $b=2$,then $(x, y)$ $(s)$ lies on $(4x^2-1)(y^2-1)=0$

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