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RyuAmakusa (709)

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Olaaa!! Perrrfect answer. 111  [188 rates]

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COS(SIN X) will repeate the value when SIN X repeates the value

SINCE COS(-SIN X)= COS(SIN X) the value is repeated after pi similarly there is a modulus for the first fn. (you first find the period then check for half of it keep on checking till the half is not a period)
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