(sin15°cos15°)/(cos^2 165°- sin^2 165°)计算

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/18 03:17:30

(sin15°cos15°)/(cos^2 165°- sin^2 165°)
=(2sin15cos15)/[2(cos2*165)]
=sin30/2cos330
=sin30/2cos(360-30)
=sin30/2cos30
=1/2*tan30
=√3/6

sin15°cos^315°-cos15°sin^315°化简求cos15°-tan15°/cos15°+sin15° 化简1：cos(15°-a)sin15°-sin(165°+a)cos(-15°) 根号6倍的sin15°+根号2倍的cos15°=什么 (cos15°-cos75°)(sin75°+sin15°)＝? tan15°+cos15°/sin15°的值求详解求sin15°+tan30°cos15°的值 sin15° 1.sin7°+cos15°sin8°/cos7°-sin15°cos8°= 求值(sin9°cos15°-sin24°)/(sin9°sin15°+cos24°) (sin7°+cos15°cos8°)/(sin7°-sin15°sin8°)的化简 tan15°、tan75°sin15°、sin75°、cos15°cos75°具体数值