I'm stuck on this one problem:(adsbygoogle = window.adsbygoogle || []).push({});

lim (x=>0) cos^2x-1/x^2

I know the answer is -1, however I'm having trouble getting there.

Can anyone help me with this? I know cos^2x-1 is also -sin^2x and I'm having trouble with getting rid of the denominator. Thanks!

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# Homework Help: Basic Limit Question

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