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1.16. (a) r*a_(x)=2 r=xa_(x)+ya_(y)+za_(z).1.18. Given points A(P=5,phi=70,quad z=-3)B(P=2,phi=-36,z=1)A(x=e cos phi,y=e sin phi,quad z=-3).=5 cost6, y=5sin 70^(@),z=-3{:[B(x,=2cos(-30),y,=2sin(-30)quad z],[,=sqrt3,,=-1])A unit vector directed at A directedIn eylindrieal coordinates,{:[R_(P)=(B-A)*a_(T)". "],[=(0.02195","-5.6984631","4)*(cos 70^(@),sin(400),0)],[=0.02195 cos 70^(@)-5.6984631 sin 70^(@)". "],[" PA "Pi4N-5.34724638.],[=(0.02195","-5-6984631","4)*(-sin(70)1cos(70))],[R phi=(B-A)*a_(phi)". "],[z=-0.02195 xx sin 70^(@)-5.6984631 xx cos 70^(@)],[-1.96961542],[R_(AB)=-54347296389 e],[" Todindunit vector in eflindrieal courdimates "],[" at "B" directed towond. "A". "],[R_(BA)=A-B=(5log 70^(@)-sqrt3,1+5sin 70^(@),-4)],[R_(P)=R_(BA)A_(P)=(0.02195","5.6984631","-4)],[{:[R_(e)=0.02195 xx(sqrt3)/(2)- ... See the full answer