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1,-1480°=-10π+16π/9,(k=-5,a=16π/9), 注意:表示一個角時,不能既有弧度,又有角度,組織要統一. 2,β=2kπ+16π/9,k∈Z 因為β∈【-4π,0), 所以當k=-1時,β=-2π/9,或 當k=-2時,β=-20π/9.
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