JEE Math Practice Question
If the function $$f(x)=\frac{\sin 3 x+\alpha \sin x-\beta \cos 3 x}{x^3}, x \in \mathbf{R}$$, is continuous at $$x=0$$, then $$f(0)$$ is equal to :
- A.4
- B.$$-$$2
- C.$$-$$4
- D.2
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