問題詳情
8. What is the sum of all possible values of ? between 0 and 360 such that the triangle in thecoordinate plane whose vertices are (cos 50°, sin 50°), (cos 70°, sin 70°), and (cos t°, sin t°) isthe isosceles?
(A) 300
(B) 330
(C) 390
(D) 420
參考答案
答案：D
難度：困難0.25
書單：沒有書單，新增