cos^4(22.5)-cos^4(67.5)=
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cos^4(22.5)-cos^4(67.5)=cos^4(22.5)-cos^4(67.5)=cos^4(22.5)-cos^4(67.5)=cos^4(22.5)-cos^4(67.5)=(cos
cos^4(22.5)-cos^4(67.5)=
cos^4(22.5)-cos^4(67.5)=
cos^4(22.5)-cos^4(67.5)=
cos^4(22.5)-cos^4(67.5)=(cos^2(22,5)+sin^2(67.5))(cos^2(22.5)-cos^2(67.5))
=cos^2(22.5)-sin^2(22.5)
=cos45
=√2/2
cos^4(22.5)-cos^4(67.5)=
∫cos^4xdx
计算：cos（π/5)+cos（2π/5)+cos(3π/5)+cos(4π/5)
求值Cos pai/17 *cos 2pai/17*cos 4pai/17*cos 8pai/17
cos(π/17)*cos(2π/17)*cos(4π/17)*cos(8π/17)
cos
cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/15)×cos(6pai/15)×cos(7pai/15)求值
cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/15)×cos(6pai/15)×cos(7pai/15)求值
5cos^2a+4cos^2β=4cosα则cos^2a+cos^2β
求值:cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11)
求值：cos(π/11)-cos(2π/11)+cos(3π/11)-cos(4π/11)+cos(5π/11)
cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11)
1+cos(2θ)+cos(4θ)+cos(6θ)=4cosθcos(2θ)cos(3θ)证明相等.
化简cos(π/4-a)cos(π/4+a)
化简cos(π/4-a)cos(π/4+a)=
sin^4+cos^4=1,求sin+cos=
化简：cos(π/4-x)乘cos(π/4+x)
arccos(cosπ/4)=cos(arccosπ/4)对吗?