cosπ/12-isinπ/12的模求cosπ/12-isinπ/12的模A 1 B√2 C -1 D cosπ/12

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cosπ/12-isinπ/12的模求cosπ/12-isinπ/12的模A1B√2C-1Dcosπ/12cosπ/12-isinπ/12的模求cosπ/12-isinπ/12的模A1B√2C-1Dc

cosπ/12-isinπ/12的模求cosπ/12-isinπ/12的模A 1 B√2 C -1 D cosπ/12
cosπ/12-isinπ/12的模
求cosπ/12-isinπ/12的模
A 1 B√2 C -1 D cosπ/12

cosπ/12-isinπ/12的模求cosπ/12-isinπ/12的模A 1 B√2 C -1 D cosπ/12
等于(cosπ/12的平方isinπ/12的平方)再开算术平方更,即等于1