题目

若角的终边经过点，且，则实数__________． 答案：【答案】.【解析】根据三角函数的定义，利用列方程，解方程求得的值.根据三角函数的定义，有，解得.________ is no doubt _______ Mo Yan, this year’s Nobel Prize winner in Literature, ever did so much on his way to success. A．It; whether                            B．There; if C．There; whether                         D．There; that