作业帮sinπ/8×cosπ/8
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sinπ/8×cosπ/8
sinπ/8×cosπ/8
sinπ/8×cosπ/8
这个是二分之一的sinπ/4也就是√2/4,建议你多看看二倍角公式,你现在应该高二吧,马上你们就会学到,二倍角是和角公式的特殊形式,以后用多了就会熟悉了,不懂的话还可以问
求SINπ/64 COSπ/64 COSπ/32 COSπ/16 COSπ/8
sinπ/8×cosπ/8
sinπ/8×cosπ/8
sinπ/8*cosπ/8
sinπ/8cosπ/8=( )
(cosπ/8+sinπ/8)（cos^3π/8-sin^3π/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.
cos 5π/8 cos π/8 + sin 5π/8 sin π/8=
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
化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α-4π)
cos^6(π/8)-sin^6(π/8)=求值,[cos^2(π/8)-sin^2(π/8)][cos^4(π/8)+sin^4(π/8)+cos^2(π/8)sin^2(π/8)]=cos(π/4)[1-cos^2(π/8)sin^2(π/8)]=cos(π/4)[1-[sin^2(π/4)]/4]==7√2/16
计算sin²π/8-cos²π/8=
cos平方π/8-sin平方π/8,
sin²π/8 -cos²π/8
sin^4π/8 +cos^4π/8
(cos(π/8))^4-(sin(π/8))^4