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Q.) 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 (a < a < π/4) with the positive direction of x-axis. The equation of its diagonal not passing through the origin is
[A]
y(cosa + sina) + x(sina - cosa) = a
[B]
y(cos a + sin a) + x(sin a + cos a) = a
[C]
y(cos a + sin a) + x(cosa- sin a) = a
[D]
y(cos a -sin a) -x(sin a - cos a) = a
[A] y(cosa + sina) + x(sina - cosa) = a
[B] y(cos a + sin a) + x(sin a + cos a) = a
[C] y(cos a + sin a) + x(cosa- sin a) = a
[D] y(cos a -sin a) -x(sin a - cos a) = a
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