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

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

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

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 sin15°cos15°怎么算