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The limit of tan4x/6x as x approaches 0

User Yochi
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\displaystyle\lim_(x\to0)(\tan4x)/(6x)=\lim_(x\to0)(\sin4x)/(4x)*(4x)/(6x\cos4x)=\frac23\lim_(x\to0)\sec4x=\frac23
User Adrian Martin
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