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                                    If the tangent to the ellipse x2+4y2=16 at the point P(ϕ) is normal to the circle x2+y2−8x−4y=0, then possible values(s) of ϕ is/are | 
                            
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Answer»  If the tangent to the ellipse x2+4y2=16 at the point P(ϕ) is normal to the circle x2+y2−8x−4y=0, then possible values(s) of ϕ is/are  | 
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