化下列复数为三角形式,2(sinπ/5+icosπ/5)-2(-sinπ/5+Icosπ/5)-2(sinπ/5-Icosπ/5)

题目详情

化下列复数为三角形式,2(sinπ/5+icosπ/5)
-2(-sinπ/5+Icosπ/5)
-2(sinπ/5-Icosπ/5)

▼优质解答

答案和解析

2(cos3/10π+isin3/10π)
化成cos在前边,sin在后边就行了.
2(cos7/10π+isin7/10π)
2(cos17/10π+isin17/10π)

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