The equation of the directrix of the parabola $y^2+4 y+4 x+2=0$ is

The angle between the tangents drawn from the point $(1,4)$ to the parabola $y^2=4 x$, is

The line $y=\mathrm{m} x+3$ is tangent to the parabola $y^2=4 x$, if the value of m is

Angle between the parabola $y^2=4(x-1)$ and $x^2+4(y-3)=0$ at the common end of their latus rectum is