急!!~谢谢!
10个回答
展开全部
1、cos2x=-1最小时,即2x=2kπ+π,x=kπ+π/2,y=4
2、sin²x=0时,即x=kπ y=5
3、log 0.5 [根号2(根号2/2 xsina-根号2/2 xcosa)]
=log0.5 [根号2 xsin(a-π/4)]
=log0.5 [根号2] +log0.5 sin(a-π/4)
=log0.5 (1/2)^(-2)+log0.5 sin(a-π/4)
=-2+log0.5 sin(a-π/4)
log 0.5x为减函数,sin(a-π/4)=1最大,y最小,a-π/4=2kπ+π/2,即a=2kπ+3π/4
y=-2++log0.5 1=-2+0
2、sin²x=0时,即x=kπ y=5
3、log 0.5 [根号2(根号2/2 xsina-根号2/2 xcosa)]
=log0.5 [根号2 xsin(a-π/4)]
=log0.5 [根号2] +log0.5 sin(a-π/4)
=log0.5 (1/2)^(-2)+log0.5 sin(a-π/4)
=-2+log0.5 sin(a-π/4)
log 0.5x为减函数,sin(a-π/4)=1最大,y最小,a-π/4=2kπ+π/2,即a=2kπ+3π/4
y=-2++log0.5 1=-2+0
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询