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7.2 正弦、余弦(1)
1.C
3.
(1)=2cos 66.5° (2)≈0.25-0.92
≈0.80 ≈-0.67
4.(1)=
(2)=
5.sin A=cos(90°-A)
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05答案网免费提供各类练习与测试答案,请牢记零五网网址:05W.CC
7.2 正弦、余弦(1)
1.C
3.
(1)=2cos 66.5° (2)≈0.25-0.92
≈0.80 ≈-0.67
4.(1)=
(2)=
5.sin A=cos(90°-A)
http://m.ksjqmj.com/buchongxitidaan/17288.html
推荐访问