已知函数f(x)=2sinx的平方(4分之π x)-根号3cos2x
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f(x)=2(sinx)^2+2sinxcosx-1=2(1-cos2x)/2+2sinxcosx-1=sin2x-cos2x=(根号2)sin(2x-π/4)T=2π/2=π
g(x)=2sinx.(sinx+cosx)-1=2sin^2x-1+2sinxcosx=sin2x-cos2x=√2sin(2x-π/4),所以把f(x)的图像向右平移π/4个单位,再把横坐标缩短到
f(x)=2sinx(sinX+cosX)=2sinxsinx+2sinxcosx=1-cos2x+sin2x=√2sin(2x-π/4)+1所以f(x)的最小正周期=2π/2=π最大值=1+√2
f(x)=sinx+cosxf'(x)=cosx-sinx=√2((1/√2)cosx-(1/√2)sinx)=√2(cos(x+π/4))f'(x)的最小正周期=2πy-f'(x)=sinx+cos
(1)已知函数f(x)=sinx+cosx,则f′(x)=sinx-cosx.代入F(x)=f(x)f′(x)+[f(x)]2易得F(x)=cos2x+sin2x+1=2sin(2x+π4)+1当2x
1.sinx≠0,∴x≠kπ.∴f(x)的定义域为{x|x≠kπ,k∈Z}2.f(x)=(sin2x-cos2x+1)/(2sinx)=(2sixcosx+2sin²x)/(2sinx)=c
f(x)=cosx+sinxf(x)=√2sin(x+π/4)(1)递增区间:2kπ-π/2≤x+π/4≤2kπ+π/2得:2kπ-3/4π≤x≤2kπ+π/4递增区间是:[2kπ-3π/4,2kπ+
f(x)=sinx*sinx+√3cosx*sinx=1/2-(1/2)cos2x+√3cosx*sinx=1/2+√3/2sin2x-1/2cox2x=1/2+sin(2x-π/6)则T=2π/w=
解f(x)=cos^2x+sinx=1-sin^2x+sinx=-sin^2x+sinx+1=-(sinx-1/2)^2+5/4故当sinx=1/2时,一有最大值5/4.再问:�е��
f(x)=√2[(√2/2)sinx+(√2/2)cosx]=√2[sinxcos(π/4)+cosxsin(π/4)]=√2sin(x+π/4)1、最大值是√2,此时x+π/4=2kπ+π/2,即取
分类谈论:1,sinx>=-cosxf(X)=0(-4/π+2kπ
f(x)=2sinx(sinx+cosx)=2sin²x+2sinxcosx=1-cos(2x)+sin(2x)=√2sin(2x-π/4)+1当2kπ-π/2≤2x-π/4≤2kπ
我一会给你发过去f=2(sinx)^2+2sinxcosx=1-cos2x=sin2x=1+根号2((根号2/2)*sin2x-(根号2/2)*cos2x)=1+根号2sin(2x-45°)所以最小正
=sin2x+cos2x+1要是再不会算你的高中就算白上了
f(x)=2sin^2x+2sinxcosx=sin2x-cos2x+1=sin(2x-π/4)+1因此最小正周期是π最大值是2
f(x)=2sinx(sinx+cosx)=2sin²x+2sinxcosx=1-cos2x+sin2x=1+√2(√2/2sin2x-√2/2cos2x)=1+√2(sin2xcosπ/4
1、f(-x)=log3(2+sinx)-log3(2-sinx)=-f(-x)所以,函数f(x)是奇函数2、f(x)=log3(4-sinx的平方)∵4-sinx的平方∈【3,4】∴函数f(x)的值
f(x)=2cos2x+sinx=2-4*(sinX)^2+(sinX)^2=2-3*(sinX)^2f(π/3)=-3*(9/4)+2=-1/4f(x)的最大值2最小值-1
f(x)=2sinx(sinx+cosx) =2sin²x+2sinxcosx =2sin²x-1+2sinxcosx+1&
再问:再问:再问:再问:再答:你这是在考试啊。。。再问:嘿嘿再答:这是违反考试规则的。再问:特殊情况再问:我选择艺术,可之前是理科,学校没换班,别人都复习了,我没人复习再答:这个不是理由。高考只能你自