SOLUTION: Evaluate limit as x approaches 0 of (cos3x-cos4x)/x^2 I have tried using L'Hopital's but differentiating the function using the quotient rule keeps squaring the denominator.

SOLUTION: Evaluate limit as x approaches 0 of (cos3x-cos4x)/x^2 I have tried using L'Hopital's but differentiating the function using the quotient rule keeps squaring the denominator.

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Question 591060: Evaluate limit as x approaches 0 of (cos3x-cos4x)/x^2
I have tried using L'Hopital's but differentiating the function using the quotient rule keeps squaring the denominator.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
When you use L'Hopital's rule, you differentiate the numerator and denominator SEPARATELY.

Let me know what you get when you do this.
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