MathematicsHard179×since 2002Q4298If \lim_\limits{x \rightarrow 0} \frac{e^{a x}-\cos (b x)-\frac{cx e^{-c x}}{2}}{1-\cos (2 x)}=17, then 5a2+b25 a^{2}+b^{2}5a2+b2 is equal toA64B68C72D76Check answerSkip