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In Fig. 14-18a, a square of edge length .232m is formed by four spheres of masses m1 = .00372 kg, m2 = .00958 kg, m3 = .00408 kg, and m4 = .00835 kg. In

*unit-vector notation*, what is the net gravitational force from them on a central sphere with mass m5 = .00424 kg?

I started out by using

*F = G*Ma*Mb/r^2*. So for the x-direction, it would be something like:

Fi = G*M3*M4/r^2 + G*M1*M2/r^2, and similar things for the y-direction.

But I don't know how to include the m5 into my equations. Do I have to involve angles and trig functions?