已知cos（α－π）＝log₂2分之∫2,求tanα＋sinα的值.
列出具体步骤.可照抄的、
人气：443 ℃ 时间：2020-02-05 23:04:59
解答
cos（α－π）＝log₂2分之根号2=1/2
所以cosα=-1/2
sinα=±根3/2
sinα=-根3/2
tanα＋sinα=根3-根3/2=根3/2
若
sinα=根3/2
tanα＋sinα=-根3+根3/2=-根3/2
所以是±根3/2
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