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[" Let "f(x)=x^(3)+alpha x^(2)+bx+5sin^(...

[" Let "f(x)=x^(3)+alpha x^(2)+bx+5sin^(2)x" be an increasing "],[" function on the set "R" .Then a and b satisfy "],[[" (a) "a^(2)-3b-15>0," (b) "a^(2)-3b+15>0],[" (c) "a^(2)-3b+15<0," (d) "a>0" and "b>0]]

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