求cosπ/5乘cos2π/5乘cos3π/5乘cos4π/5

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/04/16 21:13:23

乘以sinπ/5再除以sinπ/5
原式 = sinπ/5乘cosπ/5乘cos2π/5乘cos3π/5乘cos4π/5除sinπ/5
= 0.5乘sin2π/5乘cos2π/5乘cos3π/5乘cos4π/5除sinπ/5
= 0.25乘sin4π/5乘cos3π/5乘cos4π/5除sinπ/5
= 0.125乘sin8π/5乘cos3π/5除sinπ/5
= -0.125乘sin3π/5乘cos3π/5除sinπ/5
=-(1/16)乘sin6π/5除sinπ/5
= 1/16

求COSπ/5*COS2π/5 二倍角的.cosπ/5乘cos2π/5的值?y=cosx/(1-sinx)的单调递增区间? sinπ/10乘cosπ/5的值 1乘2乘3乘4乘5乘6乘7乘8乘9乘10减x=10000求大神帮助 1乘2乘3乘4乘5乘6乘7乘8乘9乘10乘11乘12乘.乘95乘96乘97乘98乘99乘100等于多少 1乘2乘3乘4乘5乘6乘7乘8=? 210乘209乘208乘207乘206乘205乘204乘203乘202乘201除以（10乘9乘8乘7乘6乘5乘4乘3乘2 COSπ/5乘以COS2π/5 等于2乘三,等于3乘4乘5,等于4乘5乘6乘7,求N! 1乘3乘5乘7...乘999 87050300=8乘()+7乘()+5乘()+3乘() 1乘2乘3乘4乘5乘6乘7乘8乘9.乘48乘49乘50末尾有多少个零?