If $\sec 4\theta - \sec 2\theta = 2$, then $\theta =$

The equation of the line passing through the point of intersection of the lines $x + 2y + 6 = 0$ and $2x - y = 2$ and making an intercept 5 on the y-axis is

The line $x + y = 3$ intersects the pair of straight lines $x^2 - 3xy + y^2 = 0$ at points A and B. Then the co-ordinates of the mid-point of AB are

The angle between the tangents drawn from the origin to the circle $(x-7)^2 + (y+1)^2 = 25$ is