![]()
word/media/image1.gif
![]()
word/media/image2.gif
![]()
word/media/image3.gif
例1 计算:(1) 2sin30o-3cos60o; (2) cos245o+tan60o·sin60o
![]()
word/media/image12.gif
![]()
word/media/image13.gif
![]()
word/media/image14.gif
![]()
word/media/image15.gif
![]()
word/media/image16.gif
![]()
word/media/image17_1.png![]()
word/media/image18_1.png![]()
word/media/image19_1.png
本文来源：https://www.2haoxitong.net/k/doc/ae4e6b1555270722192ef74b.html
