JEE Math Practice Question
$$If\,\mathop {\lim }\limits_{x \to 0} {{\cos (2x) + a\cos (4x) - b} \over {{x^4}}}is\,finite,\,then\,(a + b)\,is\,equal\,to:$$
- A.0
- B.$\frac{3}{4}$
- C.-1
- D.$\frac{1}{2}$
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