Mathematics, 06.05.2020 21:14, mathhelppls14

Which formula gives the x-coordinates of the maximum values for y = cos(x)?
k pi for any integer k
k pi for k = 0, plus-or-minus 2, plus-or-minus 4, ellipsis
StartFraction k pi Over 2 EndFraction for any positive integer k
StartFraction k pi Over 2 EndFraction for k = 0, plus-or-minus 2, plus-or-minus 4, ellipsis

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Which formula gives the x-coordinates of the maximum values for y = cos(x)?
k pi for any integ...