高中数学代数与函数一其他练习题143
题目内容

已知sinα=http://picflow.koolearn.com/upload/papers/g02/20120406/20120406144510892919.gif,且角α的终边在第二象限,则cosα=

2021-07-21

A.http://picflow.koolearn.com/upload/papers/g02/20120406/20120406144510945932.gif

B.http://picflow.koolearn.com/upload/papers/g02/20120406/20120406144510973943.gif

C.http://picflow.koolearn.com/upload/papers/g02/20120406/20120406144511001930.gif

D.http://picflow.koolearn.com/upload/papers/g02/20120406/20120406144511029919.gif

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