... 22 0,0−=ya; 766,0=za0,5Câu II,ý 30 20 ))(-0,640 ) ,22 0,0( (2) , (2 =−==arctgaaarctgxyφ939,0 )20 cos(cos0==φ; 3 42, 0 )20 sin(sin0==φ0,5Câu II,ý 4040)766,0),6 42, 0( (2 0,766) 22 0),0,4 32. (-0,)39.(-0,604arctg2(0,9 ... 0,766) 22 0),0,4 32. (-0,)39.(-0,604arctg2(0,9 ), sin cos (2 −=−=+=+=arctgaaaarctgzyxφφθ0,5Câu II,ý 5056,18)(0,95) ),319,0( (2 )813,0.939,0)0,548 (-0,3 42) (- ,540,0.939,0579,0).3 42, 0( (2 ) ... được:-3pn- 30 .21 .30.5=⇒=++=pn2po- 2) 1. (20 .30.5=⇒−=−++=po5pa- 50 .20 .3)1.(5=⇒−=++−=pa1Câu I,ý 6Vậy ta có:=⇒−−=10005001- 21 -003-010...