题目已知角α,β满足cos αcosβ=3/4,则sin αsinβ的取值范围是()(A)[-7/4,1/4].(B)[-1/4,7/4].(C)[-7/4,7/4].(D)[-1/4,1/4].这道题目是我校2016年高一4月份月考选择题部分的压轴题,全校1080个考生,答对者只有98人,笔者极为震惊.在命制这道题目的时候准备将其作为填空题部分的压轴题,感觉难度不小,于是将其调整至选择题部分,其实放在选择题部分, Subjects known angle α, β satisfy cos α cos β = 3/4, then the value of sin αsinβ range () (A) [- 7/4, 1/4] 4]. (C) [- 7 / 4,7 / 4]. (D) [- 1 / 4,1 / 4]. This topic is the finale of my school’s 2016 January / April 2016 multiple choice question part Questions, the school 1080 candidates, only 98 respondents, the author is extremely shocking in the life of this topic when preparing to fill it as part of the finale of the title, I feel the difficulty is not small, so adjust it to the multiple choice part, In fact, on the multiple choice part,