y=sin2x-√3cos2x=2sin(2x-π/3).而-1≤sin(2x-π/3)≤1.∴sin(2x-π/3)=1,即2x-π/3=2kπ+π/2→x=kπ+5π/12时,所求最大值为:y|max=2.∴sin(2x-π/3)=-1即2x-π/3=2kπ+3π/2→x=kπ+11π/12时,所求最小值:y|min=-2.相关推荐 1求函数y=sin2x—根号3cos2x的最...
解答一 举报 f(x)=sin2x-√3cos2x=2(1/2*sin2x-√3/2cos2x)=2(sin2xcosπ/3-cos2xsinπ/3)=2sin(2x-π/3)最小正周期T=2π/2=π因为-1 解析看不懂?免费查看同类题视频解析查看解答 更多答案(2) 相似问题 已知函数f(x)=sin2x+3cos2x (1)求函数f(x)的最大值和最小值; (2)求函数...
y=sin2x-√3cos2x=2sin(2x-π/3).对称轴2x-π/3=kπ-π/2,得x=kπ/2+π/12. 希望采纳 分析总结。 扫码下载作业帮拍照答疑一拍即得答案解析查看更多优质解析举报y结果一 题目 求y=sin2x-根号3cos2x的对称轴, 答案 y=sin2x-√3cos2x=2sin(2x-π/3).对称轴2x-π/3=kπ-π/2,得x=kπ/...
y=sin2x-√3cos2x=2sin(2x-π/3).而-1≤sin(2x-π/3)≤1.∴sin(2x-π/3)=1,即2x-π/3=2kπ+π/2→x=kπ+5π/12时,所求最大值为:y|max=2.∴sin(2x-π/3)=-1即2x-π/3=2kπ+3π/2→x=kπ+11π/12时,所求最小值:y|min=-2. 解析看不懂?免费查看同类题视频解析查看解答...
=2(1/2*sin2x-√3/2cos2x)=2(sin2xcosπ/3-cos2xsinπ/3)=2sin(2x-π/3)最小正周期T=2π/2=π 因为-1<=sin(2x-π/3)<=1 所以最大值是 f(x)=2 当f(x)是最大值时 2x-π/3=2kπ+π/2 2x=2kπ+π/2+π/3=2kπ+5π/6 x=kπ+5π/12 单调增区间:2kPai-Pai...
=2*[(1/2)sin2x-(√3/2)cos2x]=2sin(2x-π/3)向左平移m个正单位,根据左加右减得到函数:f(x)=2sin[2(x+m)-π/3]关于原点对称,则x=0时,f(x)=0 所以:f(0)=2sin(2m-π/3)=0 2m-π/3=kπ 2m=kπ+π/3 所以:m的最小值为π/6,而不是π/3 ...
y=sin2x-√3 cos2x =2(1/2sin2x-√3/2cos2x)=2(sin2x*cos60°-cos2x*sin60°)=2sin(2x-60°)值域:[-2,2]
Y=sin2x减根号3Cos2x =2sin(2x-π/3)最大值为2当2x-π/3=π/2+2kπ
解答:y=sin2x-√3cos2x =2[sin2x*(1/2)-cos2x*(√3/2)]=2[sin2x*cos(π/3)-cos2x*sin(π/3)]=2sin(2x-π/3)2x-π/3=kπ ∴ x=kπ/2+π/6 即对称中心是(kπ/2+π/6,0),k∈Z 取任意一个k值即可。
sin2x-√3cos2x=2(1/2*sin2x-√3/2*cos2x)=2(cosπ/3*sin2x-sinπ/3*cos2x)= 2sin(2x-π/3)sin(a-b)=sinacosb-cosasinb 写的蛮清楚的呀,有什么不理解了?