=cos24cos36-sin24sin36① =cos(24+36)②解释一下第一步怎么到第二步cos(24+36)是怎么得到的啊~刚刚学三角函数好多不懂,tan（a+β）=3/5,tan（β-π/4）=1/4,那么tan（α+π/4）为多少?
来源：学生作业帮助网 编辑：作业帮 时间：2024/10/22 01:25:12
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=cos24cos36-sin24sin36① =cos(24+36)②解释一下第一步怎么到第二步cos(24+36)是怎么得到的啊~刚刚学三角函数好多不懂,tan（a+β）=3/5,tan（β-π/4）=1/4,那么tan（α+π/4）为多少?
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