x = sqrt [(m*(sin1+sin2+sin3 ))^2 +(*(m1cos1+m2cos2+m3cos3 ))^2 ]

Using this formula, solve for delta x and delta y.

delta m=5

delta theta =3.4 deg

mass 1=191, mass 2=135, mass 3=74

angle 1 in degrees =48

angle 2 in degrees =210

angle 3 in degrees =263

solve for delta x and delta y

The subscripts 1, 2, and 3 refer to the three vectors. The formula for delta y is similar with the roles of sine and cosine exchanged. One important point is that delta theta must be expressed in radians for this formula to be valid.