Find All Critical Numbers for the Function $f ( x ) = x - \cos x \text { for } 0 < x < 2 \pi$

question 31

Multiple Choice

Find all critical numbers for the function $f ( x ) = x - \cos x \text { for } 0 < x < 2 \pi$ .

• A) \(\frac { \pi } { 2 }\)
• B) \(\frac { 3 \pi } { 2 }\)
• C)0
• D)None of these
• E) \(\frac { \pi } { 3 }\)
• F) \(\frac { \pi } { 4 }\)
• G)-1
• H)No critical numbers

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