更新1:
the answer should be in exact form. I cant use a calculator.
if sinx = 0.3, cos a = 0.5, find sin(pi - a). show all the steps. please help?
回答 (2)
2016-06-14 3:36 am
✔ 最佳答案
sin(pi - a) = sin(pi)cos(a) - cos(pi)sin(a)= sin(a)
= +/- sqrt(1 - 0.5^2) = +/- sqrt(3/4) = +/- sqrt(3)/2
2016-06-14 3:41 am
sin (π - a)
= cos a
= 0.5
= cos a
= 0.5
收錄日期: 2021-04-18 14:59:57
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160613193401AA5NNct