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191问答库 > 【高一数学】红笔写的过程第三行到第四行看不太懂…???求解释！！另外题目还有一个条件就是这个角是第

【高一数学】红笔写的过程第三行到第四行看不太懂…???求解释！！另外题目还有一个条件就是这个角是第

2025-03-15 16:01:51

推荐回答（2个）

回答1：

π+2kπ<θ<3π/2+2kπ
在3π+6kπ<3θ<9π/2+6kπ
∵sin3θ<=0
∴3π+6kπ<3θ<4π+6kπ
在3π+6kπ<3θ<9π/2+6kπ中，把[4π+6kπ,9π/2+6kπ)去掉即可。

回答2：

等量代换，角变成了三倍的角，然后代换进去

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