2.
	a)
		1)
(1,0,0)*((0,1,0)+2*(1,0,0))
=(1,0,0)*(2,1,0)
=1*2+1*0+0*0
=2

		2)
(3*(1,0,0)-(0,1,0)+2*(0,0,1)) * (-1*(1,0,0)+7*(0,1,0)+6*(0,0,1))
=((3,0,0)-(0,1,0)+(0,0,2))*((-1,0,0)+(0,7,0)+(0,0,6))
=(3,-1,2)*(-1,7,6)
=3*-1+-1*7+2*6=-3-7+12
=2

	b)

a=(@,0,0)+(0,2,0)+(0,0,3)=(a,2,3)
b=(3,0,0)-(0,5,0)+(0,0,6)=(3,-5,6)
a*b=0
(@,2,3)*(3,-5,6)=@*3+2*-5+3*6=3@-10+18=3@+8=0
3@=-8
@=-8/3

	c)
a=(2,-1,-2)
b=(1,-1,1)

cos(v) = (a*b)/(|a|*|b|)
|a_p|=|a|*cos(v) = (a*b)/|b|
=1/sqrt(3)
|a_p|=|yb|=y(b1+b2+b3)
y=1/3
a_p=y*b
=(1/3)*(1,-1,1)

a_v=a-a_ps
=(1/3)*(5,-2,-7)
