Find the angle between the tangents drawn to `y^2=4x ,` where it is intersected by the line `y=x-1.`

The angle between the tangents to the parabola y^2=4a x at the points where it intersects with the line x-y-a=0 is (a) pi/3 (b) pi/4 (c) pi (d) pi/2

The angle between the tangents to the parabola y^2=4a x at the points where it intersects with the line x-y-a=0 is (a) pi/3 (b) pi/4 (c) pi (d) pi/2

The angle between tangents to the parabola y^(2)=4x at the points where it intersects with the line x-y -1 =0 is

The angle between the tangents to the parabola y^(2)=4ax at the points where it intersects with the line x-y-a= 0 is

The angle between the tangents to the parabola y^(2)=4ax at the points where it intersects with the line x-y-a= 0 is

Find the angle between the tangents drawn from (1,3) to the parabola y^(2)=4x