设f(x)=(1 cosx)
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f(cosx)=1+(cosx)^2∴f(x)=1+x²;(-1≤x≤1)∴f(x)导数是f′(x)=2x;(-1≤x≤1)如果本题有什么不明白可以追问,
∫(0,π/2)[f(cosx)cosx-f'(cosx)sin^2x]dx=∫(0,π/2)d[sinxf(cosx)]=sinxf(cosx)|(0,π/2)=1*f(0)-0*f(1)=f(0)
f(x)=2-2x^2f(cosx/2)=1-cosx
f(x)=1/2sinx+根号3/2cosx=sin(x+π/3)所以最小正周期T=2π/1=2π因-1≤sin(x+π/3)≤1值域为[-1,1]
f(x)=sinx-cosx=√2sin(x-π/4)周期为2π,画出它在[0,2π]上的图像观察可知,每个周期里函数的极值和为0,共有1005个完整的周期,在剩下的半个周期里的极值为√2.
f(x)=√3/2*(cos(2x)-1)–1/2*sin2x=cos(2x+π/6)–√3/2(1)Tmin=π(2)-π/3≤x≤π/6,-π/2≤2x+π/6≤π/2值域[–√3/2,1–√3/
sin(x/2)+cosx?oR(sinx)/2+cosx1、(sinx)/2+cosx假设cty=1/2,siny=2/√5F(X)=ctgy*sinx+cosx=1/siny(cosy*sinx+
/>f[sin(x/2)]=1+cosx=1+1-2[sin(x/2)]^2=2-2[sin(x/2)]^2f(cosx)=2-2(cosx)^2
cosx=1-2(sinx/2)^2f=[sin(2/x)]=1+cosx=2-2(sinx/2)^2f(x)=2-2x^2f[cos(2/x)]=2-2[cos(2/x)]^2
f(x)=2sinx+2(sinx)^2+(cosx)^2-(sinx)^2=2sinx+(sinx)^2+(cosx)^2=2sinx+1答:f(x)=2sinx+1
已知向量a=(5(√3)cosx,cosx),b=(sinx,2cosx),设函数f(x)=a•b+|b|²;(1)求f(x)的周期及f(x)的最大值和最小值;(2)求f(x)在
f'(x)=sinX+cosX+1令其导数=0,sinx+cosX=-1,(庚号2)乘(X+四分之派)=-1,可以解出X=四分之五派或四分之七派,后面就不要我来说来吧带几个数进f'(X)去算算看是大于
f(x)=√3sinx+cosx=2sin(x+π/6),(1)f(x)的值域[-2,2]和周期T=2πf(A)=√3,A=π/2a/sinA=b/sinB,√2/2b/1=b/sinB,sinB=√
由f(x)=sinx-cosx+x+1得:f'(x)=cosx+sinx+1=√2(sinπ/4cosx+cosπ/4sinx)+1=√2sin(x+π/4)+1令f‘(x)再问:kπ-3π/4
f’(x)=cosx+sinx+1当f’(x)=0,得x=2kπ+π,和x=2kπ+3π/2为驻点,而定义域为(0,π/2)没有驻点,即也没有极值点在(0,π/2)区间上,f‘(x)>0,所以在所给区
-根号2+sin根号2-cos根号2