Why is limx→0(cos(x2))=0 but limx→0(cos(x-2)) is not defined?

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter6: Applications Of The Derivative
Section6.CR: Chapter 6 Review
Problem 36CR
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Why is limx→0(cos(x2))=0 but limx→0(cos(x-2)) is not defined?

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