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 and angle alpha (0 lt alpha lt (pi)/(4)) with the positive direction of x-axis. The equation of its diagonal not passing through the origin is

Answer»

`y(COS alpha+SIN alpha)+X(sin alpha-cos alpha)=a`
`y(cos alpha+sin alpha)+x(sin alpha+cos alpha)=a`
`y(cos alpha+sin alpha)+x(cos alpha-sin alpha)=a`
`y(cos alpha-sin alpha)-x(sin alpha-cos alpha)=a`

ANSWER :C


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