-2cos(x):  2, [-2,2], -cos(x): 1, [-1,1], -5cos(x): [-5,5], 5, -4cos(x): 4, [-4,4], -3cos(x): 3, [-3,3], -6cos(x): [-6,6], 6, -1/2cos(x): , , -2/5cos(x): , ,

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