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按道理只有實數才有反三角函數,你非要寫成30°的話,那只能將30°化為實數了30°=30°*∏/180°=∏/6arctan30°= arctan∏/6設有一個α,有tanα=∏/6,則上述arctan∏/6 =αcotarctan30°= cotarctan∏/6 =cot(…
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