0.5-cos^2(π/8)

cos(π/32)*cos(π/16)*cos(π/8)= 1-2cos^2(π/8) 求SINπ/64 COSπ/64 COSπ/32 COSπ/16 COSπ/8 cos^2(π/3-a)+cos^2(π/6+a) cos(2π/3-α)能等于cosα? 求SINπ/64 COSπ/64 COSπ/32 COSπ/16 COSπ/8!急救急救 cos 2π 等于多少? cos^2（π/6） cos(-2/3)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- 8sin(π/32)cos(π/32)cos(π/16)cos(π/8),求值