Mathematics

Mathematics

Problem

Which of the following lists contains all xx-values in the interval [−2π,π][-2\pi,\pi] at which y=cos⁡xy=\cos x attains its maximum? a) −2π,  −π,  0-2\pi,\;-\pi,\;0 b) −3π2,  π2-\dfrac{3\pi}{2},\;\dfrac{\pi}{2} c) −2π,  0-2\pi,\;0 d) −π,  0,  π-\pi,\;0,\;\pi

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