Solve%5B(x0%20%2B%20Cos@x1%20t)%5E2%20%2B%20(y0%20%2B%20Cos@y1%20t)%5E2%20%2B%20(z0%20%2B%20Cos@z1%20t)%5E2%20=%20r%5E2%20,t%5D

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