1.

A square of side "a" lies above the x-axis and has one vertex at the origin. The side passing through the origin makes an angle alpha " where " oltalphaltpi/4 with the positive direction of x-axis, the equation of its diagonal not passing through the origin is

Answer»

`(cosalpha+sinalpha)+X(cosalpha-sinalpha)=a`
`(cosalpha-sinalpha)-x(cosalpha-sinalpha)=a`
`(cosalpha+sinalpha)+x(cosalpha-sinalpha)=a`
`(cosalpha+sinalpha)+x(cosalpha+sinalpha)=a`

ANSWER :A


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