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This is a perfect time to use l'Hospital's rule:

If a fraction becomes 0/0 at the limit (like this one does),

then the limit of the fraction is equal to the limit of

(derivative of the numerator)/(derivative of the denominator) .

I'm not sure why l'Hospital's rule stuck with me all these years.

But when it's appropriate, like for this one, you can't beat it.

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Q: How do you solve the limit 1-cos3x divided sin squred2 7x approches 0?
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