nynw.net
当前位置:首页 >> 已知函数y=sin(12x?π6)(1)求该函数的周期,对称... >>

已知函数y=sin(12x?π6)(1)求该函数的周期,对称...

(1)T=2π2=π.(2)由2kπ-π2≤2x+π6≤2kπ+π2,得kπ-π3≤x≤kπ+π6,k∈Z,∴函数的单调增区间为[kπ-π3,kπ+π6](k∈Z).(3)∵x∈[0,π2],∴2x+π6∈[π6,7π6],∴-12≤sin(2x+π6)≤1,∴当2x+π6=π2,即x=π6时函数有最大值1,当2x+π6=7π6时,即x=π2,函数有...

(1)振幅A=2,周期T=π,初相为π3.(2)y=2sin(2x+π3),列表如下: X 0 π2 π 3π2 2π x π3 4π3 7π3 10π3 13π3 y 0 2 0 -2 0描点连图(3)将y=sinx图象上各点向左平移π3个单位,得到y=sin(x+π3)的图象,再把y=sin(x+π3)的图象上各点的横坐...

(1) f(x)=sin(2(x-π/12)) x∈[0,π]时,2(x-π/12)∈[-π/6,11π/6] 单调递减区间是2(x-π/12)∈[π/2,3π/2] 即x-π/12∈[π/4,3π/4] 则x∈[π/3,5π/6] (2)x∈[-π/12,π/2]时, 2(x-π/12)∈[-π/3,5π/6] 而当2(x-π/12)∈[-π/3,π/3]时,sin(2(x-π/12))∈[sin(-π/3),...

(1)函数y=23sin(12x-π4)的振幅为23,周期T=2π12=4π,频率f=1T=14π;其图象是由y=sinx的图象分三步变换而来,第一步,将y=sinx的图象向右平移π4个单位,得到y=sin(x-π4)的图象;第二步,再将得到的函数图象上的各点的横坐标伸长到原来的两...

(1)由题意可得,函数的周期为 2πω=2×π2,求得ω=2.将f(x)的图象先向右平移π6个单位,再向上平移2个单位,所得函数g(x)=sin[2(x-π6)+φ]+2-b=sin(2x+φ-π3)+2-b 为奇函数,∴φ-π3=kπ,k∈z,且2-b=0,结合0<φ<π解得 φ=π3,b=2,故函数的...

f(x)=cosxsin(x+π/6)-cos2x-1/4, =cosx(√3/2sinx+1/2cosx)-cos2x-1/4, =√3/2sinxcosx+1/2(cosx)^2-cos2x-1/4, =√3/4sin2x+1/4(1+cos2x)-cos2x-1/4, =√3/4sin2x-3/4cos2x =√3/2(1/2sin2x-√3/2cos2x) =√3/2sin(2x-π/3) 2x-π/3∈[2kπ-π/2,2kπ+π/2]单...

(I)f(x)=4cosωx?sin(ωx-π6)+1=4cosωx(32sinωx?12cosωx)+1=3sin2ωx-cos2ωx=2sin(2ωx?π6).∵函数f(x)的最小正周期是π,∴2π2ω=π,解得ω=1.∴f(x)=2sin(2x?π6).∵2kπ?π2≤2x?π6≤2kπ+π2,解得kπ?π6≤x≤kπ+π3,k∈Z.∴f(x)的单调递增区间为[k...

定义域为R 值域为[-3,1] 单调增区间[π/3+kπ,5π/6+kπ] 单调减区间[-π/6+kπ,π/3+kπ] k属于Z 图像的对称轴X=-π/6+1/2kπ k属于Z 对称中心点【π/12-1/2kπ,0】k属于Z

解 (1)列表: x π2 32π 52π 72π 92π 12x?π4 0 π2 π 32π 2π 3sin(12x?π4) 0 3 0 -3 0描点、连线,如图所示:(2)周期T=2πω=2π12=4π,振幅A=3,初相是-π4.(3)令12x?π4=π2+kπ(k∈Z),得x=2kπ+32π(k∈Z),此为对称轴方程.令12x-π4=kπ(k∈Z...

网站首页 | 网站地图
All rights reserved Powered by www.nynw.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com