设函数f(x)=1 cosπx 2
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∵f(x)=cos(2x-π/3)+(sinx)^2-(cosx)^2=cos(2x-π/3)-cos2x=2sin(2x-π/6)sin(π/6)=sin(2x-π/6).∴g(x)=[sin(2x
f(x)=cos(2x+π/3)+1/2-1/2cos2xf(C/2)=cos(C+π/3)+1/2-cosC/2=-1/4,cosCcosπ/3-sinCsinπ/3-cosC/2=-3/4,cos
另y=x+1,则f(y)=y^2————记住函数括号里的是不变的代入得f(x+1)=(x+1)^2
给你画出大概图,都是平滑曲线(2)如图x0取之范围为x<-1或x>9
1)f(x)=1+cos(2x+π/3)-(1+cos2x)/2=1/2-sin2x根号3/2最小值1/2-根号3/2最小正周期π2)c带入得sinC=根号3/2C=π/3A=π-B-C=2π/3-a
f(x)=cos(2x+π/3)+sin^2x-1/2=cos(2x+π/3)+(1-cos2x)/2-1/2=cos2xcos(π/3)-sin2xsin(π/3)-cos2x*1/2=-√3/2*
f(-1)=f(3)1-b+c=9+3b+cb=-2f(-1)=1-b+c=3+c>cf(1)=1+b+c=c-1
先算f(-1)=1*1+1=2>1所以f[f(-1)]=2*2+2-2=4再问:我数学咋办那,听不懂撒!
证明:f(x)=(1+x²)/(1-x²)=(x²-1+2)/(1-x²)=-1+2/(1-x²)在(-1,0)上任取x1,x2,设x1
f(x)=cos(2x-π/3)-cos2x-1=cos2x*cos(π/3)+sin2x*sin(π/3)-2cos2x*cos(π/3)-1=-[cos2x*cos(π/3)-sin2x*sin(
(1)解析:∵函数f(x)=cos(wx+f)(w>0,-π/2<f<0)的最小正周期为π∴w=2π/π=2,f(x)=cos(2x+f)∵f(π/4)=√3/2f(π/4)=cos
当n≥1时,f(x)在[n,n+1]上是单调递增的,f(n+1)-f(n)=(n+1)2+(n+1)+12-n2-n-12=2n+2,故f(x)的值域中的整数个数是2n+2,n=0时,值域为[f(0)
f’(x)=3X^2+f’(-1)x-3中,令X=-1,得f’(-1)=0.所以,f(X)=X^3-3X+2那么,a^3-3a+2=17,a^3-3a-15=0.(1)式b^3-3b+2=-13,b^
(1)根据题意,得f(x)=|x2-2x|=x2−2x x≤0或x≥22x−x2 0
f(x)=x2-3x+1f(a)=a2-3a+1f(-a)=a2+3a+1f(a)-f(-a)=-6a
这个用cos(α-β)好想可以做出来,最好问老师
f(x)=1/3x-2f(x2)=1/3x²-2f(x+1)=1/3(x+1)-2=1/3x-5/3
函数f(x)=2cos(π2x-π3),若对于任意的x∈R,都有f(x1)≤f(x)≤f(x2),f(x1)是函数的最小值,f(x2)是函数的最大值,|x1-x2|的最小值就是相邻最值间的距离,就是函
(1)f'(x)=-2x^2+2x+2在0≤x≤1上大于0故递增得0
f(-x)=x2+3x+1,将-x换为x所以f(x)=(-x)^2+3(-x)+1=f(-x)=x^2-3x+1所以f(x+1)=(x+1)^2-3(x+1)+1=x^2-x-1