Find the angle between the surfaces of equations at the point 3 a] Find the angle between the surfaces x^{2}+y^{2}+z^{2}=9 and z=x^{2}+y^{2}-3 at the point (2 ,-1, 2) Find the angle between the surfaces x^{2}+y^{2}+z^{2}=9 and z=x^{2}+y^{2}-3 at the point (2 ,-1, 2)
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