题目

Betty often falls ill these days.  Her father asks her_________with him. A. do sports        B. to do sports        C. doing sports           D. does sports 答案： B（1）若sinα=0.5138，则锐角α=________ （2）若2cosβ=0.7568，则锐角β=________ （3）若tanA=37.50，则∠A=________ （结果精确到1〞） 30.92° 67.77° 88°28′12″ 【解析】试题解析：(1)若sinα=0.5138，则锐角 (2)若2cosβ=0.7568，则锐角 (3)若tanA=37.50，则 故答案为：