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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 α(0<α<π4) with the positive direction of x-axis. The equation of its diagonal not passing through the origin is :


( A ) y(cosα+sinα)+x(sinαcosα)=a
( B ) y(cosα+sinα)+x(cosαsinα)=a
( C ) y(cosαsinα)x(sinαcosα)=a
( D ) y(cosα+sinα)+x(sinα+cosα)=a
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