(cot30°-√3)(cos5°+sin5°)(cos5°-sin5°)求值
问题描述:
(cot30°-√3)(cos5°+sin5°)(cos5°-sin5°)
求值
答
cot30°=√3;
cot30°-√3=0;
故原式=0;
答
0
(cot30°-√3)(cos5°+sin5°)已经等于0了