Verify the identity?
回答 (2)
2017-04-12 6:06 am
sin(w) = s
cos(w) = c
tan(w) = t
s/(s + c) = t/(t + 1)
1. cross multiply
s(t + 1) = t(s + c)
st + s = st + tc
2. t = s/c so tc = s
st + s = st + s
cos(w) = c
tan(w) = t
s/(s + c) = t/(t + 1)
1. cross multiply
s(t + 1) = t(s + c)
st + s = st + tc
2. t = s/c so tc = s
st + s = st + s
2017-04-12 5:52 am
(sin(w)/cos(w))/[(sinw+cosw)/cosw] = ...
收錄日期: 2021-04-24 00:21:12
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170411214930AAcp8do