sin22度+cos30度sin8度/cos22度-sin30度sin8度
分子=sin(30°-8°）+cos30°sin8°
=sin30°cos8°-cos30°sin8°+cos30°sin8°
=sin30°cos8°
分母=cos(30°-8°）-sin30°sin8°
=cos°cos8°+sin30°sin8°-sin30°sin8°
=cos30°cos8°
所求=sin30°/cos30°=tan30°=√3/3