(sin20°+cos30°sin10°)/(cos20°-sin30°sin10°)
问题描述:
(sin20°+cos30°sin10°)/(cos20°-sin30°sin10°)
答
原式=[sin(30°-10°)+cos30°sin10°]/[cos(30°-10°)-sin30°sin10°]
=(sin30°cos10°)/(cos30°cos10°)
=sin30°/cos30°
=(√3)/3