Question

Total number of critical points of

f(x) = max. {sin x, cos x} " x Ī (– 2p, 2p) is equal to –

• A. 5
• B. 7
• C. 4
• D. ) 3

Answer 1

Answer: (B)

7

Answer 2

Critical are

x = $\frac { - 7 \pi } { 4 }$, $\frac { - 3 \pi } { 2 }$, $\frac { - 3 \pi } { 4 }$, 0, p/4, p/2, 5p/4