Contact us
Choose a category below so we can get back to you as quickly as possible.
∵sin80°=1−cos 280°=1−cos 2(-80°)=1-k2,그래서 tan 100°=-tan 80°=-sin 80°cos 80°=-sin 80°cos(-80°)=-1-k2k.
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.