Contact us
Choose a category below so we can get back to you as quickly as possible.
tan30°+tan40°+tan50°+tan60°tan30°=tan60°tan40°=tan50°原式化為2tan60+2tan50=2tant60+2tan(45+15)=2tan60+2(tan45+tan15)/1-tan45tan15根據tan30=(tan15+tan150/1-tan15^2就能算出tan15
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.