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Let f(x)=2x^(3)+ax^(2)+bx-3cos^(2)x is ...

Let ` f(x)=2x^(3)+ax^(2)+bx-3cos^(2)x` is an increasing function for all ` x in R ` such that ` ma^(2)+nb+18 lt 0` then the value of m+n+7 is

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