已知函数f(x)=根号2asin(x-4分之π
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0≤x≤4由柯西不等式f(x)=2√x+√4-x≤√((2^2+1)(x+4-x))=2√5当且仅当x=16/5时2840取等又因为f(x)=2√x+√4-x≥√4-x≥2当且仅当x=0时,取
1,f(x)=sin²x+√3sinxcosx+2cos²x=1-cos²x+√3/2sin2x+2cos²x=cos²x+√3/2sin2x+1=(
已知:函数f(x)=2sinxcosx+2√3cos²x-√3求:(1)单调增区间和最小正周期;(2)当x∈[-π/4,π/4]时求最值.f(x)=2sinxcosx+2√3cos²
f(x)=2sinxcosx+2√3cos²x-√3=2sinxcosx+√3(2cos²x-1)=sin2x+√3cos2x=2sin(2x+π/3)最小正周期T=2π/2=π,
f(x)=2√3sinxcosx-cos2x=√3sin2x-cos2x=2(sin2x*√3/2-cos2x*1/2)=2sin(2x-π/6)x=π/12;函数f(x)的图象可以由函数y(x)=2
也可以用定义证明∵√(2+x^2)>√x^2=|x|≥-x∴函数定义域为R故可设X10∴f(X1)
F(x)=√(x+3)+1/(x+2)根式≧0,分母≠0则x+3≧0x+2≠0即x≧-3且x≠-2
f(2)=a=4+lg(2+根号5)=4+lg2*lg根号5得到lg根号5=(a-4)/lg2f(-2)=4+lg(根号5-2)=4+lg根号5/lg2=4+(a-4)/(lg2)平方
f(x)=2根号3sin方x+sin2x+根号3=根号3(2sin方x+1)+sin2x=根号3(1-cos2x+1)+sin2x=2根号3-根号3cos2x+sin2x=2sin(2x-60度)+2
奇函数证明:f(-x)=log((根号1+X^2)-x)=log(1/X+根号1+X^2)(分子有理化)=-log(X+根号1+X^2)=-f(x)得证
x>=0时f(x)
f(x)=sin2x-2√3(cosx)^2+√3=sin2x-√3(1+cos2x)+√3=sin2x-√3cos2x=2sin(2x-π/3)π/4=再问:π/6=
已知函数f(x)=根号3sin2x+cos2x+21求f(x)的最大值及f(x)取得最大值时自变量x集合f(x)=根号3sin2x+cos2x+2=2[(根号3/2)sin2x+(1/2)cos2x]
f(x)=sinxcosx+√3(cosx)^2-√3/2=(1/2)sin2x+(√3/2)cos2x=sin2xcosπ/3+cos2xsinπ/3=sin(2x+π/3)1.0
f(x)=√2(sinx-cosx)=2*【sinxcos(-π/4)+cosxsin(-π/4)】=2sin(x-π/4)1)、f(x)的最小正周期为T=2π值域为【-2,2】2)、图像过点(α,6
已知函数f(x)=根号log1/2(x-1)定义域为集合A,函数g(X)=3的m-2x-x^2次方减1值域为集合B,A∪B=B,求M取值范围f(x)=√log(x-1)的定义域是:由log(x-1)≥
1:(sinwx)^2+√3sinwxsin(wx+π\2)=(sinwx)^2+√3sinwxcoswx=2[(sinwx)^2+(√3\2)sin2wx]\2=[2(sinwx)^2+√3sin2
f(x)=√3cos²x+sinxcosx-√3/2=√3(cos2x+1)/2+sin2x/2-√3/2=√3/2cos2x+√3/2+1/2sin2x-√3/2=1/2sin2x+√3/
整理一下f(x)=sin^2(x)+a/2sinx+1/2讨论sinx的范围得a=3
设√x+1=tx=(t-1)²f(√x+1)=f(t)=(t-1)²+2(t-1)=t²-2t+1+2t-2=t²-1所以f(x)=x²-1