Hi

Im a bit stuck

I have done the cross multiplication

i --- j --- k

F1 --- F2 --- F2

G1 ---G2 --- G3

(F2G3 - F3G2)i + (G1F3 - G3F1)j + (F1G2 - F2G1)k

Then cross multilpies it again

so

i --------------------- j -------------------- k

d/dx -------------------- d/dy ---------------------- d/dz

F2G3 - F3G2-------------- G1F3 - G3F1--------------------- F1G2 - F2G1

And done this and got

(d/dy(F1G2 - F2G1) - d/dz (G1F3 - G3F1))i+ (d/dz(F2G3 - F3G2) - d/dx(F1G2 - F2G1))j+ (d/dx(G1F3 - G3F1) - d/dy(F2G3 - F3G2))k

Now i dont know how to shows this is FdivG - GdivF + (G.Delta)F - (F.Delta)G

Thanks