Problem

Find the limit. Use I'Hospital's Rule where appropriate. If there is a more elementary method, consider using it. \[ \lim _{x \rightarrow 0} \frac{\tan (7 x)}{\sin (6 x)} \]

Solution

Step 1 :We are given the limit \(\lim _{x \rightarrow 0} \frac{\tan (7 x)}{\sin (6 x)}\).

Step 2 :As x approaches 0, both the numerator and the denominator approach 0. This is an indeterminate form, so we can apply L'Hopital's Rule.

Step 3 :L'Hopital's Rule states that the limit of a quotient of two functions as x approaches a certain value is equal to the limit of the quotients of their derivatives, provided the limit exists.

Step 4 :First, we find the derivative of the numerator, \(\tan(7x)\), which is \(7\sec^2(7x)\).

Step 5 :Next, we find the derivative of the denominator, \(\sin(6x)\), which is \(6\cos(6x)\).

Step 6 :We then find the limit of the quotient of these derivatives as x approaches 0, which simplifies to \(\frac{7}{6}\).

Step 7 :Thus, the limit of the given function as x approaches 0 is \(\boxed{\frac{7}{6}}\).

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Source: https://solvelyapp.com/problems/31385/

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