JEE Math Practice Question
If $$\lim\limits_{x \rightarrow 0} \frac{e^{a x}-\cos (b x)-\frac{cx e^{-c x}}{2}}{1-\cos (2 x)}=17$$, then $$5 a^{2}+b^{2}$$ is equal to
- A.64
- B.68
- C.72
- D.76
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