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f(x)=(4x^2+5x+1)(5x+6)
f(x)=(20x^3+49x^2+35x+6)
f'(x)=60x^2+98x+35
f'(x)= (4+0)(5+0)(1+0)
f"(X)= (4)(5)(1)
f"(x)= 20