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Graph f(x)=2cos⁡(x)+1f(x)=2 \cos (x)+1 On the Interval −180∘≤x≤400∘-180^{\circ} \leq x \leq 400^{\circ}

Question 25

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Graph f(x)=2cos⁡(x)+1f(x)=2 \cos (x)+1 on the interval −180∘≤x≤400∘-180^{\circ} \leq x \leq 400^{\circ} . Find the intervals on which
A) f(x)f(x) is decreasing.
B) f(x)f(x) is concave up.

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