sin15°/sin5°-cos15°/cos5°=

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sin15°/sin5°-cos15°/cos5°=
sin15°/sin5°-cos15°/cos5°=

sin15°/sin5°-cos15°/cos5°=
sin15cos5/sin5cos5-cos15sin5/cos5sin5
=sin(15-5)/0.5sin10=2

sin15°/sin5°-cos15°/cos5°
= (sin15°cos5°-cos15°sin5°)/sin5°cos5°
=sin(15-5)°/(1/2sin10°)
=1/2 *sin10°/sin10°
=1/2

sin20度=sin15度cos5度-cos15度sin5度 cos20度=cos15度cos5度-sin15度sin5度所以 (sin15度cos5度-sin20度)/(cos15度cos5度-cos20度) =ctan

sin15°/sin5°-cos15°/cos5°= 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