If an inflection point of the aurve f(x)= a cos(2.x) + b sin(3x) is P(1 / 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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