Let f(x)=xcos−1(−sin∣x∣),x∈[−2π,2π], then which of the following is true?
Held on 8 Jan 2020 · Verified 6 Jul 2026.
f′ is increasing in (−2π,0) and decreasing in (0,2π)
f′(0)=−2π
f is not differentiable at x=0
f′ is decreasing in (−2π,0) and increasing in (0,2π)
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