函数g(x)=cos(x- π除以12)-sin(x π除以12)是
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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
(1)由题设知:f(x)=cos²(x+π/12)=1/2[1+cos(2x+π/6)]∵x=x0是函数y=f(x)图像的一条对称轴∴2x0=kπ-π/6(k∈Z)∴g(x0)=1+1/2s
f(x)=cos(x-π/)+sin^2x-cos^2x=-cosx+sin^2x-cos^2x=-2cos^2x-cosx+1最小正周期2π
第一题X应该是π/3吧,那个很简单的,根据极值求的a值,再根据导数小于0求的递减区间.第二题证明需要借助几何图形,做一个半径为1的圆,设角度为X,由图形可知三角形的面积要小于粗线围城的扇形面积,即1/
(1)f(x)=cos²xg(x)=1+(1/2)sin2xf(x)=g(x)(cosx)^2=1+(1/2)sin2x(cos2x+1)/2=1+(1/2)sin2xsin2x-cos2x
(1)f(x)=sin(x-π/6)+cos(x-π/3),g(x)=2sin²x/2f(x)=sinxcosπ/6-cosxsinπ/6+cosxcosπ/3+sinxsinπ/3=√3s
已知函数f(x)=1+sinxcosx,g(x)=[cos(x+(π/12))]^2f(x)=1+sinxcosx=1+(1/2)sin2xg(x)=[cos(x+(π/12)]^2=[cos(2x+
f(x)=sin(x/2)-√3[1-cos(x/2)]+√3=2[(1/2)sin(x/2)+(√3/2)cos(x/2)]=2sin(x/2+π/3)(1)g(x)=f(x+π/3)=2sin[(
首先f(-x)=f(x),得出是关于Y轴对称,f(0)要不是最大值,要不是最小值,排除B,D因为g的绝对值小于n/2,n就是PAI,所以单从SIN和COS上考虑,SIN移动一个正数(这个正数小于n/2
因为t(x)是奇函数且不是偶函数,所以t(-x)=-t(x)且t(-x)≠t(x)又t(x)=f(x)+g(X)=sin(x+α)+cos(x+β)=sinxcosα+cosxsinα+cosxcos
利用二倍角公式,则有:f(x)=-2(sin2x)^2/(-2sin2x)+cos2x=sin2x+cos2x=根号2sin(2x+pi/4)所以最小正周期为pi,2kpi+pi/2
f(x)=cos(2x-π/3)-(cos^2x-sin^2x)=cos(2x-π/3)-cos2x=2sin(2x-π/6)sinπ/6=sin(2x-π/6)因为y=sinx的单减区间为[π/2+
f(x)=cos(π/3+x)cos(π/3-x),=(cosxcosπ/3-sinxsinπ/3)(cosxcosπ/3+sinxsinπ/3)=(1/2cosx-√3/2sinx)(1/2cosx
(1)设X=Xo是函数y=f(x)图像的一条对称轴,求g(x).\x0d因为f(x)=1+(1/2)sin2x,对于正弦函数来说,当x=xo为对称轴时函数f(x)取得最大值或者最小值.即:sin2x=
t=f(x)再问:我想要具体的答案,谢谢.再答:f(x)=sin(2x-π/6)+1t=f(x)t范围[0,2]设h(t)=h(f(x))=g(x)h(t)=t^2+t,t范围[0,2]值域[0,6]
正在做啊再问:恩再答:cos[π/2-(π/3+x)]=cos(π/6-x)=sin(π/3+x)y=sin(x+π/3)cos(π/6-x)=sin(x+π/3)sin(π/3+x)=sin
f(x)=[cos(x+π/12)]^2=[1+cos{2(2x+π/6)}]÷2(x=5π/12对称轴)代入g(x)=1+1/2sin2x=5/4(2)h(x)=[cos(x+π/12)]^2+1+
由x-π3∈[2kπ,2kπ+π],可得x∈[π3+2kπ , 4π3+2kπ](k∈Z),∴函数y=cos(x-π3)的单调递减区间是[π3+2kπ , 4π
1.cos(x+60)=cos60cosx-sin60sinx=0.5cosx-(√3/2)sinxcos(60-x)=cos60cosx+sin60sinx=0.5cosx+(√3/2)sinx∴f