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因為cosx+sinx=1,所以,(cosx+sinx)的平方=1又因為(cosx)的平方+(sinx)的平方=1所以,sinxcosx=0所以,sinx=0或cosx=0當sinx=0時,cosx=1,則(cosx)的n次方+(sinx)的n次方=1當cosx=0時,sinx=1,則(cosx)的n…
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