在三角形ABC中,角A,B,C对应边分别为a,b,c,且b=1,c=√3,∠C=2/3π...答:(1)因为b=1,c=√3,∠C=2/3π,所以由正弦定理得:sinB=1/2,B=30°,所以cosB=√3/2,(2)因为C=120°,B=30°,所以A=30°,所以a=b=1
三角形ABC中,a,b,c是A,B,C所对的边,S是该三角形的面积,且cosB/cosC=...答:Riley went to the Miami Heat training camp guide Riley "Sun Sentinel" message, the NBA (microblogging) summer league this coming year, no arrangements, and so the Heat can only be organized their very own three-day "mini-training camp" to review the rookie who voted. Heat ...