高中数学题sinπ/12·cosπ/12

高中数学题sinπ/12·cosπ/12 【高中数学题】【在线等】【必采纳】已知函数f(x)=cos(2x-5π/3)+2sin(x-π/4)sin(x+π/4) cos*π/12—sin*π/12 计算cosπ/12*sinπ/12 求值：sin(π/12)+cos(π/12) （cosπ/12-sinπ/12)*(COSπ/12+sinπ/12)等于 cos sin π √ sinπ/24*cosπ/24*sinπ/12=—— 答案是这么写的:1/2(2sinπ/24*cosπ/24)cosπ 已知α=7/12π,那么cosα√（1-sinα）/(1+sinα)+sinα√（1-cosα）/(1-cosα)= 根号3×cosπ／12－sinπ／12=? cos(π/12)^4+sin(π/12)^4= 求sin π/12-(根号3)cos π/12