化简cos^8(π/8)+cos^8(3π/8)+cos^8(5π/8)+cos^8(7π/8)
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化简cos^8(π/8)+cos^8(3π/8)+cos^8(5π/8)+cos^8(7π/8)
cos(π/32)*cos(π/16)*cos(π/8)=
cos^2 π/8+cos ^2 3π/8+ cos^2 5π/8+cos^2 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)*cosπ/8
cos(5π/8)*cos(π/8)=
cos(-8π/3)求值
cos(-8π/3)求值
函数 (4 20:28:50)cos^4 (π /8)+cos^4(3π/8)+cos^4(5π/8)+cos^4(7π/8) =
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
COS(π/17)COS(2π/17)COS(4π/17)COS(8π/17)要过程
化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α-4π)
三角函数解方程 (cos 3x)^3+ (cos 5x)^3 = 8 (cos 4x)^3 (cos x)^3
8sin(π/32)cos(π/32)cos(π/16)cos(π/8),求值
(cosπ/8+sinπ/8)(cos^3π/8-sin^3π/8)