Two muscles on the back of the leg pull upwards on the Achilles tendon. Each force makes an angle of θ=20∘θ=20∘ with the vertical, with one pulling up and to the right and the other pulling up and to the left. Each force has a magnitude F=F=573 N. Write an expression for the magnitude of the sum, FsumFsum, of these two forces.  What is the magnitude, in newtons, of the sum of these two forces?

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