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plot sin(x/5) + cos(x/6) and 2 * cos(x /60 - pi * 1/4) and - 2 * cos(x /60 - pi * 1/4)
plot sin(x/5) + cos(x/6) and 2 * cos(x /60 - pi * 1/4) and - 2 * cos(x /60 - pi * 1/4)
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