1. The sine of the angle between the straight line \(\frac{x-2}{3}\) = \(\frac{y-3}{4}\) = \(\frac{z-4}{5}\) and the plane 2x – 2y + z = 5 is

2. The reflection of the point (a, β, γ) in the xy-plane is

3. The area of the quadrilateral ABCD, where A(0, 4, 1), B(2, 3, -1), C(4, 5, 0) and D(2, 6, 2) is equal to

4. The plane 2x – 3y + 6z – 11 = 0 makes an angle sin

5. The cosines of the angle between any two diagonals of a cube is