4. What is the distance between the point (1,2,4) and the plane 3x+ 2y+ 6z= 5?
5. What is the distance between the parallel planes ax+by+cz=d1 and ax+by+cz=d2?
You may wish to try picking a point on one plane that you can specify exactly and
working out the distance from that point to the other plane.
3. What is the cosine of the angle between the plane x+y+z= 5 and any of the
coordinate planes? What about the cosine of the angle between x+y+z= 5 and
x+ 2y+ 3z= 5?
2. Assume that A=<ax,0,0>, B=<bx,by,bz>, and C=<cx,cy,cz>, and demonstrate that
the following vector identity holds:
Ax(BxC) = (A.C)B-(A.B)C
Note that if you replace the subscript "x" by "i", "y" by j, and "z" by k, and then cycle
x->y->z->x appropriately, you've proven the identity is true in general.
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