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A square of side a lies above the x-axis...

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(0ltalphaltpi/ 4)` with the positive direction of x-axis. equation its diagonal not passing through origin is (a) `y(cosalpha+sinalpha)+x(sinalpha-cosalpha)="a`(b)`y(cosalpha+sinalpha)+x(sinalpha+cosalpha)=a`(c)`y(cosalpha+sinalpha)+x(cosalpha-sinalpha)=a`(d)`y(cosalpha-sinalpha)-x(sinalpha-cosalpha)=a`

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