（cosπ/12-sinπ/12)(cosπ/12+sinπ/12)的值为
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（cosπ/12-sinπ/12)(cosπ/12+sinπ/12)的值为（cosπ/12-sinπ/12)(cosπ/12+sinπ/12)的值为（cosπ/12-sinπ/12)(cosπ/12+
（cosπ/12-sinπ/12)(cosπ/12+sinπ/12)的值为
（cosπ/12-sinπ/12)(cosπ/12+sinπ/12)的值为
（cosπ/12-sinπ/12)(cosπ/12+sinπ/12)的值为
由（cosπ/12-sinπ/12)(cosπ/12+sinπ/12)=cos^2(π/12)-sin^2(π/12)=cosπ/6=cos30=sin60=根号3/2 cos2a=cos^2a-sin^2a
cos^2(π/12)-sin^2(π/12)=cosπ/6
平方差公式和倍角的余弦公式结合
（sinπ/24)(cosπ/24)(cosπ/12)
（sinπ/24)(cosπ/24)(cosπ/12)
sinπ/12*cosπ/12=?
求值：sin(π/12)+cos(π/12)
sin(π/12)-cos(π/12)=
cos*π/12—sin*π/12
cosπ／12乘以sinπ／12
计算cosπ/12*sinπ/12
（cosπ/12-sinπ/12)*(COSπ/12+sinπ/12)等于
(cosπ/12 -sinπ/12)(cosπ/12 +sinπ/12)等于
（cosπ/12-sinπ/12)(cosπ/12+sinπ/12)的值为
（cosπ/12 -sinπ/12）（cosπ/12 +sinπ/12）=
(sinπ/12+cosπ/12)(sinπ/12-cosπ/12)=
已知α=7/12π,那么cosα√（1-sinα）/(1+sinα)+sinα√（1-cosα）/(1-cosα)=
cos^2π/12-sin^2π/12等于
sin(π/12)cos(π/12)的值
求sin π/12-(根号3)cos π/12
cosπ/12+(根号3)×sinπ/12的值