Contact us
Choose a category below so we can get back to you as quickly as possible.
因為sinα+cosα=15,則(sinα+cosα)2=125∴2sinαcosα=sin2α=-2425 ; ; ; ;又∵0<α<π∴3π4<α<π,則3π2<2α<2π,即cos2α=1-sin′22α=725∴tanα=sin2α1+cos2α=-34故tanα的值為-34.
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.