Select one:
a. {θ| θ = π/2}
b. {θ| θ = π/2 + kπ, k is any odd integer}
c. {θ | θ = 1}
d. {θ| θ = π+kπ/2, k is any integer}
e. No solution
收錄日期: 2021-04-21 00:14:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140316170048AAXUqBV