Let f(x) = cos (x). Prove that f is continuous on [a,b] and f has a derivative in (a,b), for all real numbers a and b.

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.
Chapter9: Multivariable Calculus
Section9.2: Partial Derivatives
Problem 48E
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Let f(x) = cos (x). Prove that f is continuous on [a,b] and f has a derivative in (a,b), for all real numbers a and b.

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