已知f(x)=2cos平方x 根号3sin2x a在(2)的条件下x的集合
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1、a=1/2f(x)=1-sin²2x-sin2x-2=-sin²2x-sin2x-1=-(sin2x+1/2)²-3/4-1
f(x)=cos(2x-π/6)-cos(2x+π/6)+2cos²x=cos2xcos(π/6)+sin2xsin(π/6)-[cos2xcos(π/6)-sin2xsin(π/6)]+2
一f(x)=sin"xcos"x2sinxcosxcos2x=1sin2xcos2x=_/2sin(2x派/4)1所以T=2派/2=派"指平方“_/2”指根号2二因为X属于[0派/2]是增函数.当2x
f(x)=√3sinxcosx+cos?x=√3/2sin2x+(cos2x+1)/2=√3/2sin2x+1/2cos2x+1/2=sin(2x+π/6)+1/2f(x)的最小正周期为2π/2=π∵
(1)f(x)=2√3sinxcosx+2cos²x+3=√3sin2x+1+cos2x+3=2(√3/2*sin2x+1/2*cos2x)+4=2sin(2x+π/6)+4∵x属于(0,π
f(x)=1/2sinx+1/2cosx(二倍角的正弦、余弦公式)=根号2/2(sinxcos45°+cosxsin45°)=根号2/2sin(x+45°)(1)f(a)=根号2/2sin(a+45°
f(x)=sinx+cosx.f(x)=2f(-x),tanx=1/3(cos的平方x-sinxcosx)/(1+sin平方x)=(cos^2x-sinxcosx)/(2sinx+cosx)=(1-t
f(x)=sin²(x)+(√3)sin(x)cos(x)+2cos²(x)=3/2+√3/2sin2x+1/2cos2x=3/2+sin(2x+π/6)函数f(x)的最小正周期T
y=sinx^2+根3sinxcosx+2cosx^2=-1/2(1-2sinx^2)+1/2根3*2sinxcosx+2cosx^2-1+3/2=-1/2cos2x+二分之根3倍sin2x+cos2
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=
f(x)=√3sinxcosx+cos²x=(√3/2)sin2x+(1+cos2x)/2-1/2=(√3/2)sin2x+(1/2)cos2x=sin2x*cos(π/6)+cos2x*s
1、f(x)=1/2*sinx+(1+cosx)/2-1/2=1/2(sinx+cosx)=(√2/2)(sinx*√2/2+cosx*√2/2)=(√2/2)(sinxcosπ/4+cosxsinπ
【1】f(x)=(1-sin2x)/(2cosx^2)f(x)=(1-sin2x)/(1+cos2x)1+cos2x≠0cos2x≠-12x≠π+2kπx≠π/2+kπ函数定义域:{x|x≠π/2+k
由题意可得:f(x)=(cosx)^2-(sinx)^2-2sinxcosx=cos2x-sin2x=√2cos(2x+π/4)所以f(x)的最大值为√2,最小值为-√2
f(x)=(sinx+cosx)^2-2cos^2x=1--2cos^2x+2sinxcosx=sin2x-cosx=√2sin(2x-π/4)f(x)最小正周期T=πf(-π/12)=-√2sin(
f(x)=2cos²(x/2)-sinx+1=(1+cosx)-sinx+1=√2cos(x+π/4)+2(1)f(x)的周期为2π;由2kπ-π≤x+π/4≤2kπ得:2kπ-5π/4≤x
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解:⑴f(x)=-1/2+sin(π/6-2x)+cos(2x-π/3)+(cosx)^2=-1/2+sinπ/6cos2x-sin2xcosπ/6+cos2xcosπ/3+sin2xsinπ/3+(