1.

The x-y plane is rotatedabout its line of intersection with the y-z plane by `45^0`, then the equation of thenew plane is/area. `z+x=0`b. `z-y=0`c. `x+y+z=0`d. `z-x=0`A. `z+x=0`B. `z-y=0`C. `x+y+z=0`D. `z-x=0`

Answer» Correct Answer - a, d
The equation of a plane passing through the line of intersection of the `x-y and y-z` planes is
`" "z+lamdax=0, lamdain R`
This plane makes an angle `45^(@)` with the `x-y` plane `(z=0)`. Thus,
`" "cos45^(@) = (1)/(sqrt(1)sqrt(lamda^(2)+1))`
or `" "lamda= pm 1`


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