L-hospital rule Assignment Help

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L'Hospital's rule:

Suppose f(x) and g(x) be two provided functions differentiable in the neighbourhood of the point 'a', excluding at the point 'a' itself. If 1508_L-hospital rule.png f(x)=1508_L-hospital rule.pngg(x) = 0. Or,  1508_L-hospital rule.pngf(x) = 1508_L-hospital rule.pngg(x) = ∞. Then1508_L-hospital rule.pngf(x)/g(x) = 1508_L-hospital rule.pngf'(x)/g'(x) given that the limit on the right exists as a finite number or is ±∞.

Problem: If 2224_L-hospital rule1.png then calculate the value of a.

Solution:  Since the applying limit is in the form of 0/0, we may use  L' Hospital's  principle

                         1784_L-hospital rule2.png

                              It is fulfilled only when a = 1.

Remark:

  • L'Hospitals principle is not always useful. Suppose the example, 1299_L-hospital rule3.png .

            Here, if we apply L' Hospital's Principle, then 2233_L-hospital rule4.png

            Now, each the Nr and the Dr are undefined because 516_L-hospital rule6.png cos x doesn't exist.

            We may calculate this limit as follows:

      723_L-hospital rule5.png

 

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