sin15°cos^315°-cos15°sin^315°化简

来源：学生作业帮助网编辑：作业帮时间：2024/05/14 13:17:54

sin15°cos^315°-cos15°sin^315°化简
sin15°cos^315°-cos15°sin^315°化简

sin15°cos^315°-cos15°sin^315°化简
原式=sin 15° cos 15° [ (cos 15°)^2 -(sin 15°)^2 ]
=(1/2) *(2 sin 15° cos 15°) *cos 30°
=(1/2) *sin 30° *(根号3)/2
=(1/2) *(1/2) *(根号3)/2
= (根号3)/8.
= = = = = = = = =
分解因式,再用二倍角公式.
已用计算器验证.

sin15°cos^315°-cos15°sin^315°化简化简sin15°-cos15°/sin15°+cos15° (sin15°－cos15°)/(sin15°+cos15°)= sin15°-cos15°/sin15°+cos15°的值? 化简sin15°-cos15°/sin15°+cos15° sin15°-cos15°/sin15°+cos15°的值? sin15°cos15°等于 sin15°+cos15°过程 sin15°cos15°等于? 化简：sin15°*cos15° cos15°-sin15°=? sin15°cos15°= sin15°cos15°是什么意思 sin15°+cos15°= 求cos15°-tan15°/cos15°+sin15° 化简（sin15 °+cos15°）2 sin15°=?cos15°=? 求sin15°+cos15°的值