已知函数y=3sin(2分之1x-4分之π)
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/11 10:37:10
(1)对称轴1/2x--π/4=kπ+π/21/2x=kπ+3π/4对称轴x=2kπ+3π/2,k∈Z(2)对称中心1/2x--π/4=kπ1/2x=kπ+π/4x=2kπ+π/2对称中心(2kπ+π
振幅为2;周期为π;初相为π/3单增区间:kπ-5π/12≦x≦kπ+π/12对称轴:x=﹙1/2﹚kπ+(1/12)π
y=sinx的减区间应该是[π/2+2kπ,3π/2+2kπ](/是分数线的意思)所以y=2sin(2x+π/6)的减区间是2x+π/6∈[π/2+2kπ,3π/2+2kπ]即π/2+2kπ=
y=sinx的减区间应该是[π/2+2kπ,3π/2+2kπ](/是分数线的意思)所以y=2sin(2x+π/6)的减区间是2x+π/6∈[π/2+2kπ,3π/2+2kπ]即π/2+2kπ=
(0,1)代入原式知sinφ=1/2因为|φ|
函数f(x)=sinx的单增区间是【-π/2+2kπ,π/2+2kπ】所以,y=3sin(2x+π/3)的单增区间即,-π/2+2kπ
设t=3x+π/3,则y=sin(3x+π/3)=sint的单调递增区间为:2kπ-π/2≤t≤2kπ+π/2,k∈Z也即2kπ-π/2≤3x+π/3≤2kπ+π/2得2kπ/3-5π/18≤x≤2k
y=sin²x+sinx+cosx+2=(1-cos2x)/2+√2sin(x+л/4)+2=(1/2)*sin(2x+л/2)+√2*sin(x+л/4)+5/2;=(1/2)*sin(2
y=2sin(π/6-1/3x)=-2sin(1/3x-π/6)得到T=2π/(1/3)=6π令1/3x-π/6=kπ+π/2得到x=3kπ+2π所以函数的对称轴是x=3kπ+2π令1/3x-π/6=
我列个去,就算我高中毕业到现在已经8年了,我也看的出来1楼的乱说的撒,值域明显是[-2,2]嘛
f(x)=2sin^2x+cos(2x-π/3)-1=(2sin^2x-1)+cos(2x-π/3)=-cos2x+1/2*cos2x+√3/2*sin2x=√3/2*sin2x-1/2*cos2x=
因为,-π/2
(1)令3x+6/π=π/2+2kπ,k取整数,》》》(2)3x+6/π属于(π/2+2kπ,3π/2+2kπ),k取整数》》》》3x+6/π=2kπ,k取整数》》》(3)x不变y缩小1/2并上移1个
再问:你怎么知道要分k=0和k=1呢。。原谅我智商捉急再答:这种题目先求出通解,通常从k=0开始求出具体区间,再试0的左右即-1和1,然后与给定区间求交集。用这种方法不易错,也不易漏区间。
解答;f(x)=sin(2x+3分之π)∴sin(2x+π/3)=-3/5∵x∈(0,π/2)∴2x+π/3∈(π/3,4π/3)∵sin(2x+π/3)
解1当2kπ-π/2≤2x+π/3≤2kπ+π/2,k属于Z时,y是增函数即2kπ-5π/6≤2x≤2kπ+π/6,k属于Z时,y是增函数即kπ-5π/12≤x≤kπ+π/12,k属于Z时,y是增函数
1:y=2sin(x+π/6)-2cosx=2[sinxcosπ/6+cosxsinπ/6]-2cosx=√3sinx+cosx-2cosx=√3sinx-cosx=2sin(x-π/6)2:y=2c
1、定义域是Rx系数是1所以T=2π/1=2π2、五点法即sin里取0,π/2,π,3π/2,π则x-π/3=0,x=π/3,sin(x-π/3)=0x-π/3=π/2,x=5π/6,sin(x-π/
y=sin(1/2x+π/3),x属于R当1/2x+π/3=2kπ+π/2时,y=sin(1/2x+π/3)有最大值1此时x=4kπ+π-2π/3=4kπ+π/3,k∈Z当1/2x+π/3∈【2kπ+