这个题貌似有问题,sin(π+α)=-sinα对吧,log8 1/4=-2/3,也就是说sinα=2/3,但是题目给的α∈(-π/2,0)使sinα显然是小于零的,所以不对.
已知sin(π+α)=log以8为底真数为1/4且α∈(-π/2,0)求tan(3π/2+α)的值
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