Expression 3: "K" left parenthesis, "x" , "y" , right parenthesis equals StartFraction, "x" squared plus "y" squared minus "x" "P" cos left parenthesis, 5 , right parenthesis plus "y" "P" cos left parenthesis, 20 , right parenthesis Over "x" sin left parenthesis, 5 , right parenthesis minus "y" sin left parenthesis, 20 , right parenthesis , EndFractionKx,y=x2+y2−xPcos5+yPcos20xsin5−ysin20
3
Expression 4: "x" squared plus "y" squared minus 2 "x" "y" cosine left parenthesis, 165 , right parenthesis equals "P" squared plus "L" squared plus "K" left parenthesis, "x" , "y" , right parenthesis squared plus 2 "L" "K" left parenthesis, "x" , "y" , right parenthesis left brace, "x" greater than 0 , right brace left brace, "y" greater than 0 , right bracex2+y2−2xycos165=P2+L2+Kx,y2+2LKx,yx>0y>0