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Find the limit. Use l'Hospital's Rule if appropriate. If there is a more elementary method, consider using it.lim x→0+ (8x + 1)cot(x)

Question

Find the limit. Use l'Hospital's Rule if appropriate. If there is a more elementary method, consider using it.lim x→0+ (8x + 1)cot(x)

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Solution

To find the limit of the function as x approaches 0 from the right, we can use l'Hospital's Rule. This 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 of the original quotient is of the form 0/0 or ∞/∞.

The function given is not in the form of a quotient, but we can rewrite it as one by expressing cot(x) as cos(x)/sin(x). So, the function becomes (8x + 1) * (cos(x)/sin(x)) = (8x + 1)cos(x) / sin(x).

Now, we can apply l'Hospital's Rule. The derivative of the numerator, (8x + 1)cos(x), is -8xsin(x) + 8cos(x) + cos(x) using the product rule. The derivative of the denominator, sin(x), is cos(x).

So, the limit as x approaches 0 from the right of the original function is equal to the limit as x approaches 0 from the right of (-8xsin(x) + 9cos(x)) / cos(x).

As x approaches 0, -8xsin(x) approaches 0 and cos(x) approaches 1. So, the limit of the function as x approaches 0 from the right is 9.

This problem has been solved

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