f(x)=cos(2x-三分之派)+2sin(x-四分之派)sin(x+四分之派)化简的最后结...
f=cos(2x-三分之派)+2sin(x-四分之派)sin(x+四分之派) =cos三分之派+2sin四分之派sin四分之派 =二分之一+2乘以二分之根号二乘以二分之根号二 =二分之一+一 =知道答案了吧···(给分 打字好累的)
函数fx=cos(2x-π\/3)+2sin(x-π\/4)sin(x+π\/4) 怎么化简?
f(x)=cos(2x-π\/3)+2sin(x-π\/4)sin(x+π\/4)=(1\/2)cos2x+ (√ 3\/2)sin2x +( cos(π\/2) -cos2x )=-(1\/2)cos2x +(√ 3\/2)sin2x = sin(2x-π\/6)
已知函数为f(x)=cos(2x-π╱3)+2sin(x-π\/4)sin(x+π\/4)
解:f(x)=cos(2x-π\/3)+2sin(x-π\/4)sin(x+π\/2-π\/4)=cos(2x-π\/3)+2sin(x-π\/4)cos(x-π\/4)=cos(2x-π\/3)+sin(2x-π\/2)=cos(2x-π\/3)-cos2x =√3\/2sin2x-1\/2cos2x =sin(2x-π\/6)最小正周期T=π,对称轴方程x=kπ\/2+5\/12π(k为整数)(2)-π\/...
已知函数f(x)=cos(2x-3分之π)+2sin(x-4分之π)sin(x+4分之π)
L=(k+1\/3)\/2*pi;
已知函数fx=cos(2x-π\/3)+2sin(x-π\/4)sin(x+π\/4)
f(x)=cos(2x-π\/3)+2sin(x-π\/4)sin(x+π\/4)=cos(2x-π\/3)+2sin(x-π\/4)cos[π\/2-(x+π\/4)]=cos(2x-π\/3)+2sin(x-π\/4)cos(π\/4-x)=cos(2x-π\/3)+2sin(x-π\/4)cos(x-π\/4)=cos(2x-π\/3)+sin(2x-π\/2)=cos2x*(1\/2)+sin2x*(√3\/2)-cos2x =(...
已知函数f(x)=cos(2x-π\/3)+2sin(x-π\/4)sin(x+\/4...
f(x)=cos(2x-π\/3)+2sin(x-π\/4)sin(x+π\/4)=cos2xcosπ\/3+sin2xsinπ\/3+2(sinxcosπ\/4-cosxsinπ\/4)(sinxcosπ\/4+cosxsinπ\/4)=(1\/2)cos2x+(√3\/2)sin2x+2[(√2\/2)sinx-(√2\/2)cosx][(√2\/2)sinx+(√2\/2)cosx]=(1\/2)cos2x+(√3\/2)sin2x+(sinx)^2-...
已知函数f(x)=cos(2x-3\/派)+2sin(x-4\/派)sin(x+4\/派)1。求f(x)的最...
根据和差化积的公式,得 原式=2sin (2x-派\/6)sin (派\/6)=sin (2x-派\/6)周期T=2派\/2=派,对称轴:2x-派\/6=派\/2+k派 (k属于整数)x=派\/3+k派\/2 (k属于整数)因为函数 f(x)在-派\/6到派\/3为单调增函数 所以函数 f(x)在-派\/12到派\/2上的值域为:[-根号3\/2,1]...
已知函数f(x)=cos(2x-π\/3)+2sin(x-π\/4)sin(x+π\/4) 求函数f(x
所以原式=cos(2x-π\/3)+2sin(x-π\/4)cos(x-π\/4)=cos(2x-π\/3)+sin(2x-π\/2)=1\/2cos(2x)+√3\/2sin(2x)-cos(2x)=√3\/2sin(2x)-1\/2cos(2x)=-cos(2x+60)最小正周期=2π\/2=π 对称轴=kπ\/2 根据图像和单调性可知,当x=-π\/12时,函数得最小值-√3\/2,...
已知函数f(x)=cos(2x-π\/3)+2sin(x-π\/4)sin(x+π\/4)
2sin(x-π\/4)sin(x+π\/4)=cos(x-π\/4-x-π\/4)-cos(x-π\/4+x+π\/4)=-cos2x f(x)=cos(2x-π\/3)-cos2x=cos(2x-π\/6-π\/6)-cos(2x-π\/6+π\/6)=2sin(2x-π\/6)sin(π\/6)=sin(2x-π\/6)最小正周期是2π\/2=π,图象对称轴很容易知道是π\/3+nπ\/2 ...
已知函数f(x)=cos(2x-π\/3)+2sin(x-π\/4)sin(x+π\/4)
f(x)=cos(2x-π\/3)+2sin(x-π\/4)sin(x+π\/4)=1\/2cos 2x+根号3\/2sin 2x+2*(根号2\/2sin x-根号2\/2cos x)(根号2\/2sin x+根号2\/2cos x)=1\/2cos 2x+根号3\/2sin 2x+ 2*根号2\/2 * 根号2\/2 *(sin x+cos x)(sin x-cos x)=1\/2cos 2x+根号3\/2sin 2x+ ...