已知y=sin(π÷4-2x),求函数的最小正周期-搜答案-搜搜考试网

分析:函数y=2sin(2x-π/4)的图象的对称轴的位置为取最值的地方,对称中心为函数值为0的地方.因为2x-π/4=kπ+π/2(k为整数)解得x=kπ/2+3π/8,所以函数y=2sin(2x-

sin^2(x-y)+sin^2(y-z)+sin^2(z-x)=[1-cos2(x-y)+1-cos2(y-z)+1-cos2(z-x)]/2=3/2-[(cos2xcos2y+sin2xsin2y

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

（0,1）代入原式知sinφ=1/2因为|φ|

y=4sin(2x+π/4)+1单调区间为：单调增：2kπ-π/2

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

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

sin(π/4+x/2)sin(π/4-x/2)=sin(π/4+x/2)sin[π/2-(π/4+x/2)]∵π/4=π/2-π/4∴sin(π/4-x/2)=sin(π/2-π/4-x)=sin[

模型y=Asin(ωX+ψ)振幅A=4周期T=2π/ω=4π最大值=A=4最小值=-A=-4

(1)x-π/12π/65π/122π/311π/122x+π/60π/2π3π/22πy=1/22sin(2x+π/6)01/20-1/20(2)由题意,A=1/2设最小正周期为T,则T/2=4π/

y=2cosxsin(x+π/3)-根号3*(sin^2)x+sinxcosx,后两项先提出一个sinx,然后括号内部分用叠加原理,得到y=2cosxsin(x+π/3)+2sinxcos(x+π/3

函数y取最大值,2x+π/6=2kπ+π/2即x=kπ+π/6y=2sin(x/2+π/3）的图像是由y=sinx先纵坐标不变,横坐标扩大2倍变为y=sinx/2再向左平移π/3个单位,变为y=sin

因为,-π/2

sinx+siny+sinz-sin(x+y+z)=4sin[(x+y)/2]sin[(x+z)/2]sin[(y+z)/2]sinx+siny+sinz-sin(x+y+z)=2sin[(x+y)/

x∈[-2π/9,π/6]3x+π/3∈[-π/3,5π/6]sin(3x+π/3)∈[-√3/2,1]2sin(3x+π/3)∈[-√3,2]函数的最大值=2函数的最小值=-√3

f(x)=(1+1/tanx)*(sinx)^2-2sin(x+π/2)sin(x-π/4)=(1+cosx/sinx)*(sinx)^2+2sin(x+π/4)cos[(x-π/4)+π/2]=(s

任何正弦函数,只要系数是1,值域就是[-1,1]

g（x）=f（x+π/12）=2sin[2(x+π/12)+π/6]=2sin(2x+π/3),g(-x)=2sin[2(-x)+π/3]=-2sin(2x-π/3)≠土g(x),∴g(x)非奇非偶.