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If f(x)=(acos x-cos b x)/(x^2),x!=0a n d...

If `f(x)=(acos x-cos b x)/(x^2),x!=0a n df(0)=4` is continous at `x=0,` then the ordered pair `(a ,b)` is a.`(+-1,3)` b. `(1,+-3)` c. `(-1,-3)` d. `(-1,3)`

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