2023-07-25 20:12发布
令f(x)=(sinx-1)/(cosx-2)=t则sinx-1=t(cosx-2)sinx-tcosx=1-2t所以|1-2t|≤√(t^2+1)(1-2t)
令f(x)=(sinx-1)/(cosx-2)=t则sinx-1=t(cosx-2)sinx-tcosx=1-2t所以|1-2t|≤√(t^2+1)(1-2t)^2≤t^2+11-4t+4t^2≤t^2+13t^2-4t≤00≤t≤4/3本回答被提问者采纳
最多设置5个标签!
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','http://hwaiwenda.com/data/attach/logo/logo.png', '推荐 的问题《f(x)=sinx-1/cosx-2 的最大值和最小值》','https://hwaiwenda.com/answer/14073/32360.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
令f(x)=(sinx-1)/(cosx-2)=t
则sinx-1=t(cosx-2)
sinx-tcosx=1-2t
所以|1-2t|≤√(t^2+1)
(1-2t)^2≤t^2+1
1-4t+4t^2≤t^2+1
3t^2-4t≤0
0≤t≤4/3本回答被提问者采纳
一周热门 更多>