飞雪VS无痕
幼苗
共回答了17个问题采纳率：94.1% 举报
-π/2＜x＜0,
(sinx+cosx)^2=1+2sinxcosx=1/25
2sinxcosx=-24/25
(sinx-cosx)^2=1-2sinxcosx=49/25
sinx-cosx=±7/5 ∵sinx+cosx=1/5 ,-π/2＜x＜0,cosx>0
cosx=4/5
3sinx^2-2sinxcosx+cosx^2
=3-2cosx^2 -2sinxcosx
=3-32/25+24/25
=67/25
1年前
1
