1.

A square of side length a units lies above the x−axis and has one vertex at the origin. The side passing through the origin makes an angle α(0<α<π/4) with the positive direction of x−axis. The equation of its diagonal not passing through the origin is

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A square of side length a units lies above the xaxis and has one vertex at the origin. The side passing through the origin makes an angle α(0<α<π/4) with the positive direction of xaxis. The equation of its diagonal not passing through the origin is



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