if a , b , and y are the interior angle of a triangle , simpify :
[ sin a sin b + sin(b+y)sin(a+y) ] / [ cos a sin b - cos(b+y)sin(a+y) ]
simpifiy maths(sin,cos,tan)
2011-04-01 6:24 am
回答 (1)
2011-04-01 6:40 am
收錄日期: 2021-04-23 23:23:54
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110331000051KK01353