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[" .et "a,b in R" and "f:R rarr R" be de...

[" .et "a,b in R" and "f:R rarr R" be defined by "],[" " "(x)=a cos(|x^(3)-x|)+b|x|sin(|x^(3)+x],[" Then "f" is "],[" (A) "differentiable" at "x=0" ,if "a=0" and "b=],[" (B) differentiable at "x=1" ,if "a=1" and "b=],[" (C) "[" not differentiable at "x=0" ,if "a=1" and "],[b=0]],[" (D) not differentiable at "x=1" ,if "a=1" and "],[b=1]

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