21. Explain why the function is discontinuous at the given number a. Sketch the graph of the

21. Explain why the function is discontinuous at the given number a. Sketch the graph of the function.

f(x)={cos⁡x if x⋖0 0 if x=0 1-x^2 if x⋗0),a=0

Calculus: Early Transcendentals
Chapter 2: Limits and Derivatives
Section 2.5: Continuity
Problem 21

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