If 0 lt=a lt=3,0 lt=b lt=3 and the equat...

If `0 lt=a lt=3`,`0 lt=b lt=3` and the equation : `x^(2) + 4 + 3cos(ax + b)=2x` has at least one solution, then the value of `a + b` is :

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The correct Answer is:

`a+b = pi`

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