cos(5π/8)*cos（π/8)=
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cos(5π/8)*cos（π/8)=cos(5π/8)*cos（π/8)=cos(5π/8)*cos（π/8)=cos(5π/8)=cos(π/2+π/8)=-sin(π/8)∴cos(5π/8)*
cos(5π/8)*cos（π/8)=
cos(5π/8)*cos（π/8)=
cos(5π/8)*cos（π/8)=
cos(5π/8)=cos(π/2+π/8)=-sin(π/8)
∴ cos(5π/8)*cos（π/8)
= -sin(π/8)*cos（π/8)
= -(1/2)*sin(π/4)
= -(1/2)*(√2/2)
= -√2/4
cos(π/32)*cos(π/16)*cos(π/8)=
cos(5π/8)*cos（π/8)=
cos^2 π/8+cos ^2 3π/8+ cos^2 5π/8+cos^2 7π/8=?
cos（5π/8）*cosπ/8
化简cos^8(π/8)+cos^8(3π/8)+cos^8(5π/8)+cos^8(7π/8)
函数 (4 20:28:50)cos^4 (π /8)+cos^4(3π/8)+cos^4(5π/8)+cos^4(7π/8) =
求SINπ/64 COSπ/64 COSπ/32 COSπ/16 COSπ/8
cos(π/17)*cos(2π/17)*cos(4π/17)*cos(8π/17)
cos 5π/8 cos π/8 + sin 5π/8 sin π/8=
sin5π/8=cosπ/8?
sinπ/8cosπ/8=( )
cos(π/12)cos(5π/12)=
2cos^2π/8-1=?
cos^2-π/8-1/2=?
cos²（π/8）-0.5=
不用计算器,求(cos(π/8))^4+(cos(3π/8))^4+(cos(5π/8))^4+(cos(7π/8))^4的值
0.5-cos^2(π/8)
求SINπ/64 COSπ/64 COSπ/32 COSπ/16 COSπ/8!急救急救