Evaluate the limits, using L’Hôpital’s Rule.

\displaystyle{ \lim_{x\to 0} \frac{\sin(4 x)}{\sin(10 x)} = \;} \displaystyle{ \lim_{x\to 0} \frac{\sin(a x)}{\sin(b x)} = \;} (assuming b \neq 0 )

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