If an inflection point of the aurve f(x)=acos(2.x)+bsin(3x) is P(7/6,5), then what are the real numbers a and b ? A) a = 0,b= 1 B) a =-1,b 1 C) a = 18, b=-4 D) a = 2,b= 1 E) Does not exist

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