... x= π + kπ 2 cos x cot x = m ⇔ x = ± arccos m + k2π = m ⇔ x = arc cot m + kπ tanx=0 ⇔ sinx=0 ⇔ x=kπ; 3. cosx=1 ⇔ x = k2π π ...
確定! 回上一頁