求sin6度乘以cos24度乘以sin78度乘以cos48度得值_数学解答

求sin6度乘以cos24度乘以sin78度乘以cos48度得值

人气：152 ℃　时间：2020-08-26 00:34:40

解答

原式=sin(6)cos(12)cos(24）cos（48）=sin(6)cos(6)cos(12)cos(24)cos(48)/cos(6)
=0.5sin(12)cos(12)cos(24)cos(48)/cos(6)=……=(1/16)sin(96)/cos(6)=(1/16)cos(6）/cos(6)=1/16