f(x)= ax^2 + bx + c . modulus of f(x) <=1 for x<=1. prove that mod (a )+ mod(b) + mod(c) <= 7.
f(x)= ax^2 + bx + c . modulus of f(x) <=1 for x<=1. prove that mod (a )+ mod(b) + mod(c) <= 7.


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