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How do to solve:Lim  (tg 5x)/(4x) whit x-> 0Thanks!must be resolved based on the...

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leitosalvatierra | Student, Undergraduate | eNotes Newbie

Posted October 25, 2011 at 6:39 AM via web

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How do to solve:

Lim  (tg 5x)/(4x) whit x-> 0
Thanks!

must be resolved based on the remarkable limits

Tagged with help, limits, math, maths, question, solve

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sciencesolve | Teacher | (Level 3) Educator Emeritus

Posted December 2, 2011 at 2:59 AM (Answer #1)

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Use the remarkable limit `lim_(u(x)->0)``(tan u(x))/u(x) = 1`

You should create this remarkable limit in your function, therefore you should divide and multiply by the argument of tangent function.

`lim_(x-gt0) ((tan 5x)/(5x))*(5x/4x) = lim_(x-gt0)((tan 5x)/(5x))*lim_(x-gt0)(5x)/(4x)`

`lim_(x-gt0)((tan 5x)/(4x))= 1*lim_(x-gt0)((5x)/(4x)) = 5/4`

Therefore, the limit of the fraction`((tan 5x)/(4x))`  is 5/4.

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