If x, y, z are in A.P. and `t a n^(-1)x ,""t a n^(-1)y""a n d""t a n^(-1)z` are also in A.P., then (1) `2x""=""3y""=""6z` (2) `6x""=""3y""=""2z` (3) `6x""=""4y""=""3z` (4) `x""=""y""=""z`

If x, y, z are in A.P. and t a n^(-1)x ,""t a n^(-1)y"" and ""t a n^(-1)z are also in A.P., then (1) 2x""=""3y""=""6z (2) 6x""=""3y""=""2z (3) 6x""=""4y""=""3z (4) x""=""y""=""z

If x, y, z are in A.P. and tan^(-1)x , tan^(-1)y and t a n^(-1)z are also in A.P., then (1) 2x""=""3y""=""6z (2) 6x""=""3y""=""2z (3) 6x""=""4y""=""3z (4) x""=""y""=""z

If x, y, z are in A.P. and tan^(-1) x, tan^(-1) y and tan^(-1)z are also in A.P. then show that x=y=z and y≠0

If x, y, z are in A.P. and tan^(-1) x, tan^(-1) y and tan^(-1)z are also in A.P. then show that x=y=z and y≠0

If (1)/(x) , (1)/(y) , (1)/(z) are A.P. show that (y+z)/(x) , (z+x)/(y) , (x+y)/(z) are in A.P.

The equation of the plane containing the line 2x-5y""+""z""=""3;""x""+""y""+""4z""=""5 , and parallel to the plane, x""+""3y""+""6z""=""1 , is : (1) 2x""+""6y""+""12 z""=""13 (2) x""+""3y""+""6z""=-7 (3) x""+""3y""+""6z""=""7 (4) 2x""+""6y""+""12 z""=-13

The equation of the plane containing the line 2x-5y""+""z""=""3;""x""+""y""+""4z""=""5 , and parallel to the plane, x""+""3y""+""6z""=""1 , is : (1) 2x""+""6y""+""12 z""=""13 (2) x""+""3y""+""6z""=-7 (3) x""+""3y""+""6z""=""7 (4) 2x""+""6y""+""12 z""=-13