Question: Solve.......... a) The sphere r? + y?+ 2? = 4 and the surface 4r + y + 2z = 9 has two common tangent planes.
Solve..........

a) The sphere r? + y?+ 2? = 4 and the surface 4r + y + 2z = 9 has two common tangent planes. Find the equations of these planes
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