sinπ8cosπ8

求SINπ/64 COSπ/64 COSπ/32 COSπ/16 COSπ/8 (cosπ/8+sinπ/8)（cos^3π/8-sin^3π/8） (cos π/8+ sin π/8 ) (cos^3 π/8+sin^3 π/8 )的值. 8sin(π/32)cos(π/32)cos(π/16)cos(π/8),求值 求SINπ/64 COSπ/64 COSπ/32 COSπ/16 COSπ/8!急救急救 cos sin π √ 【1】化简：sin(a-5π）/cos(3π-a）×cos(π/2-a）/sin(a-3π）×cos(8π-a）/sin 化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α- sin²π/8 -cos²π/8 计算：cos（π/8）*sin（π/8）=? 不用计算机求sinπ/8,cosπ/8 化简：[1+2sin(α+2π)*cos(α-2π)]/[sin(α+4π)+cos(α+8π)]