Contact us
Choose a category below so we can get back to you as quickly as possible.
在△AOC中 sin∠AOC=AC/AO=3/5 又AC=AB/2=8 代入 AO=40/3 畢氏定理解得OC=32/3 cos∠COA=OC/AO=4/5 tan∠AOC=AC/OC=3/4
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.