№1.7. Given four points A1 (5, 5, 4); A2 (1; 1; 4); A3 (3, 5, 1); A4 (5; 8; 1). Be the equation: a) plane A1A2A3; b) direct A1A2; c) direct A4M; perpendicular to the plane of A1A2A3; g) direct A3N; parallel line A1 A2; d) a plane passing through A4; perpendicular to the line A1A2. Calculate: e) The sine of the angle between the line and the plane A1A4 A1A2A3; g) the cosine of the angle between the coordinate plane and the plane Oxy A1A2A3.
№2.7. The equation of the plane passing through point A (3; 4; 0) and a line .....
№3.7. Find the point of intersection of the line .... and the plane 2x + 3y + z - 1 = 0.

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