已知f(x)=二分之根号三sin2x-cosx平方-二分之一
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f(x)=cosx/2(sinx/2+√3cosx/2)-√3/2=sinx/2cosx/2+√3cos²x/2-√3/2=1/2sinx+√3/2(1+cosx)-√3/2=sinxcos
f(x)=√3/2cosx+1/2sinx+1=sin(x+π/3)+1.值域为[0,2]sin(c+π/3)=4/5,因为派/6
派再问:求过程再答:再答:给好评再问:三角形3边ABC满足B^2=AC求f(B的取值范围。。)再答:先给好评,立马帮你解决再答:应该是abc吧?再问:嗯。再问:?
f(x)=√3sin^2x+sinxcosx-(√3/2)(x∈R)=√3*[(1-cos2x)/2]+(1/2)sin2x-(√3/2)=(√3/2)-(√3/2)cos2x+(1/2)sin2x-
(1)由f(x)=cosx+根号3cos(x+二分之兀)化简得:f(X)=-2sin(x-π/6)要f(X)有最大值,则sin(x-π/6)=-1故:X-π/6=-π/2+2Kπ,K∈Z得出X=-π/
f(x)=√3/2sin2x-3/2cos2x=√3(1/2sin2x-√3/2cos2x)=√3sin(2x-π/3)f(x)最小正周期T=2π/2=π由2kπ-π/2≤2x-π/3≤2kπ+π/2
f(x)=根号3cos^x+sinxcosx-根号3/2=根号3*(1+cos2x)/2+sin2x/2-根号3/2所以f(派/8)=根号3*(1+cos派/4)/2+sin(派/4)/2-根号3/2
150度
先化简:f(x)=√3/2sin2x-cos²x-1/2=√3/2sin2x-(1+cos2x)/2-1/2=√3/2sin2x-1/2cos2x-1=sin(2x-π/6)-1,∵f(C)
1、当cos2x=1时,为最小值a-b=-1/2当cos2x=-1时,为最大值a+b=3/2联立方程组解得b=1,a=1/22、g(x)后是等号吧?a、b直接代入,还是要求什么啊?再问:求g(x)=-
(1)cos²x=1/2(1+cos2x),sinxcosx=1/2sin2x∴f(x)=1/4(1+cos2x)+√3/4sin2x+1=1/4cos2x+√3/4sin2x+5/4=1/
答:手机提问无法在电脑中显示平方f(x)=√3/2-√3(sinwx)^2-sinwxcoswxf(x)=√3/2*[1-2(sinωx)^2]-(1/2)*2sinωxcosωxf(x)=(√3/2
f(x)=√3/2-√3sin²ωx-sinωxcosωx=√3/2(1-2sin²ωx)-1/2*2sinωxcosωx=√3/2*cos2wx-1/2sin2wx=cos2wx
f(x)=cos(3x/2)cos(x/2)-sin(3x/2)sin(x/2)-2sinxcosx=cos(3x/2+x/2)-2sinxcosx=cos2x-sin2x=√2(√2/2*cos2x
(1)f=(2x+π/3)+3根号3/2正周期T=2π/2=π对称轴2x+π/3=π/2+2kπ∴2x=π/6+2kπ∴x=π/12+kπ,k∈z(2)∵-π/2+2kπ≤2x+π/3≤π/2+2kπ
f(x)=x^(3/2+k*(1/2)^k)(k∈Z)因为f(x)为偶函数且在(0,+∞)上是增函数所以3/2+k*(1/2)^k为偶数所以k=1(2)因为f(x)在(0,+∞)上是减函数所以3/2+
f(x)=2sinx/2cosx/2√3cosx=sin(x/2x/2)√3cosx=sinx√3cosx=√(1^2√3^2)sin(xπ/3)=2sin(xπ/3)函数f(x)的最小正周期T=2π
f(x)=cosx-(-sinx)=sinx+cosx=√2(√2/2*sinx+√2/2cosx)=√2(sinxcosπ/4+cosxsinπ/4)=√2sin(x+π/4)所以最大值=√2f(a
f(x)=1/2*sinxcosx+√3/2*(sinx)^2=1/4*sin(2x)+√3/2*[1-cos(2x)]/2=1/4*sin(2x)-√3/4*cos(2x)+√3/4=1/2*[1/