cosπ／12乘以sinπ／12

cosπ／12乘以sinπ／12 化简f(x)=sin(x/2+π/12)乘以cos(x/2+π/12)-cosx/2乘以cosx/2 sinπ/12-根号3乘以cosπ/12的值是多少 （sinπ/24)(cosπ/24)(cosπ/12) （sinπ/24)(cosπ/24)(cosπ/12) cos平方乘以π/8-sin平方乘以π/8详细过程 sinπ/12*cosπ/12=? 求值：sin(π/12)+cos(π/12) sin(π/12)-cos(π/12)= cos*π/12—sin*π/12 计算cosπ/12*sinπ/12 cos^4π/8sin^4π/8等于cos^4π/8乘以sin^4π/8等于 （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)= 化简：cos(α-π/2)/sin(5π/2+α)乘以sin(α-2π)乘以cos（2π-α）