A square of side `4 a` lies above the `x` -axis and has one vertex at the origin. The side passing through the origin makes are angle alpha (0 < alpha < (pi)/(4))' with the positive direction of `x` -axis. The equation of its diagonal not passing through the origin is

Options

A. `y(cos alpha+sin alpha)+x(cos alpha-sin alpha)=4a`
B. `y(cos alpha-sin alpha)-x cdot(sin alpha-cos alpha)=4a`
C. `y(cos alpha+sin alpha)+x(sin alpha-cos alpha)=4a`
D. `y(cos alpha+sin alpha)+x^(-)(sin alpha+cos alpha)=4a`

Answer

A