试题 试卷
题型:解答题 题类:常考题 难易度:普通
(1)sinA=0.75,求A;
(2)cosB=0.888 9,求B;
(3)tanC=45.43,求C;
(4)tanD=0.974 2,求D.
(1)sin71°24′
(2)cos54°21′18″
(3)tan21°17′23″.
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