已知=                                                    ...

來源:國語幫 3.37W

問題詳情:

已知已知=                                                    ...=                                                                 

A.m                           B.-m                        C.已知=                                                    ... 第2張               D.-已知=                                                    ... 第3張

【回答】

B

知識點:三角恆等變換

題型:選擇題

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