作业帮cos（π/4-x)cos(π/4+x)=根号2/6(
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cos（π/4-x)cos(π/4+x)=根号2/6(
cos（π/4-x)cos(π/4+x)=根号2/6(
cos（π/4-x)cos(π/4+x)=根号2/6(
π/4-x+π/4+x=π/2 cos（π/4-x)cos(π/4+x)=sin（π/4+x)cos(π/4+x)==1/2sin（π/2+2x)
=1/2cos2x=√2/6 cos2x=√2/3 sin2x==√7/3
化简：cos(π/4-x)乘cos(π/4+x)
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函数y=cos(x-π/4)cos(x+π/4)的值域是?
cos（π/4-x)cos(π/4+x)=根号2/6(
y=cos(π/4+x)cos(π/4-x)+cos2x值域RT,
三角函数运算 为什么 cos2x+cos( 4π/3 -2x)=cos( π/3 +2x)
cos(2x-π)/[根号2cos(x+π/4)]=-1/5,0