若将函数f(x)=sin(x )图像向左平移7 12,所得函数图像关于原点对称
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f(x)=sin²x=(-1/2)(1-2sin²x)+1/2=-(1/2)cos2x+1/2所以f(x)周期是:π
①原式=f(x)=2cos2x+sinx^2=2cos2x+1-cos2x/2=3/2cos2x+1/2故f(π/3)=3/2*cos2π/3+1/2=-3/4+1/2=-1/4②依f(x)=3/2c
f(x)=sin²x+sinxcosx=[1-cos(2x)]/2+sin(2x)/2=sin(2x)/2-cos(2x)/2+1/2=(√2/2)sin(2x-π/4)+1/2最小正周期T
∵f(x)=sin(2x+π6),∴将函数f(x)=sin(2x+π6)的图象向右平移π6个单位,得:f(x-π6)=sin[2(x-π6)+π6]=sin(2x-π6),所得的图象对应的函数解析式是
其图像经过点M(π/3,1/2)代入f(x)=sin(x+φ)1/2=sin(π/3+φ)∵0<φ<π∴π/3<π/3+φ<4π/3∵1/2=sin(π/3+φ)∴π/3+φ=
答:f(x)=sin²x+sin2x+3cos²x=sin²x+cos²x+sin2x+2cos²x利用二倍角公式cos2x=2cos²x-
∵f(x)=2sin2x−23sinxsin(x−π2)=2sin2x+23sinxcosx=1−cos2x+3sin2x=1+2sin(2x−π6)∵0<x<2π3∴−π6<2x−π6<7π6∴−1
函数f(x)=2sin(ωx−π3)(ϖ>0)的图象向左平移π3ω个单位,得到函数y=g(x)=2sinωx,y=g(x)在[0,π4]上为增函数,所以T4≥π4,即:ω≤2,所以ω的最大值为:2.故
f(x)=sinx[sinx-sin(x兀/3)]sin(x+π/3)吗
f(x)=(1+cotx)sin^2(x)-2sin(x+∏/4)sin(x-∏/4)=sin^2(x)+sinxcosx+cos2x=1/2(1-cos2x)+sinxcosx+cos2x=1/2(
f(x)=Sin(2x/3+π/3)+√3/2(-π/2+3kπ,√3/2)k∈ZCosB=(a^2+c^2-b^2)/2ac≥(2ac-b^2)/2ac=1/2,即B∈(0,π/3]f(x)∈[Si
f(x)=sin^2x+sinxcosx-sin^2x+cos^2x=sinxcosx+cos^2x=sin2x/2+(1+cos2x)/2=sin2x/2+cos2x/2+1/2(1)f(a)=si
将函数f(x)=sin(2x+θ)(-π/20∴φ=-π/6+π=5π/6
w*pi/6=4/3pi+n*2pi,所以最小w*pi/6=-2/3pi,w绝对值最小为4
f的导数为-cos(三分之派-x),转换为cos(π+三分之派-x),f=cos(六分之π+x)即向右平移二分之π第一道选择C
按偶函数的定义来做f(x)=sin(x+a)+cos(x-a)=sinxcosa+cosxsina+cosxcosa+sinxsina=sinx(cosa+sina)+cosx(sina+cosa)s
由题意得到,ω(x−π6)=ωx−43π+2kπ,(k∈Z)所以ω=8-12k,k∈Z,则k=1时,|ω|min=4,故答案为:4.
函数f(x)=sin(x+π6)+sin(x-π6)=sinxcosπ6+cosxsinπ6+sinxcosπ6-cosxsinπ6=3sinx.设M(x0,3sinx0),N(x0,cosx0),则
f(x)=[cos(x)+sin(x)]sin(x)=cos(x)sin(x)+sin^2(x)=1/2sin2x+1/2(1-cos2x)=√2/2[cos(p/4)sin2x-sin(p/4)co