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This calculus video tutorial provides more examples on evaluating limits with fractions and square roots. You need to multiply the complex fraction by the common denominator and by the conjugate of the radical expression.
Calculus Video Playlist:
https://www.youtube.com/watch?v=1xATmTI-YY8&t=25s&list=PL0o_zxa4K1BWYThyV4T2Allw6zY0jEumv&index=1
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