试题 试卷
题型:解答题 题类:常考题 难易度:普通
(1)已知sinα=0.4771,求∠α;
(2)已知cosα=0.8451,求∠α;
(3)已知tanα=1.4106,求∠α.
(1)sinα=0.5018.(2)cosA=0.6531.(3)tanβ=0.3750.
(1)sin23°5′+cos66°45′
(2)sin27.8°﹣tan15°8′.
试题篮