Question

cos90度和sin90度分别4等于多少？

Answer 1

1. cos90°=0，sin90°=1

2. sin是正弦函数的符号，正弦函数f(x)=sinx的定义域为R，值域为[-1，1]，属于奇函数，最小正周期为2π。详细内容参见http://baike.baidu.com/link?url=-li2RJ14qttwCwrhIOvI4c8VnSi2pMZerx8V8TkQn0KcB4mnXWRXKRX-MOu1b-fwa1DZQQSilV8-4ZoIa8kG-_

3. cos是余弦函数的符号，正弦函数f(x)=cosx的定义域为R，值域为[-1，1]，属于偶函数，最小正周期为2π。详参http://baike.baidu.com/link?url=d5bgfaX5fYtOGIvo0FXwbCAaq_cD0PG_Jgb3VuvoJiECBpJHTazu16Cngj3I8hL22DJrHDBDV3R6m3PDR6Z688FyQkicy2Vv8mMn0eX4UoKXNV-PH-RRr93eYGqUxHQ3Sj2R8LRGwOMOAELeW-aCrrc_X9YUcDJjjfrsSRY8jmc2e_0uIaDb82WL3ij3apQ3
   

Answer 2

cos90°=0
sin90°=1

Answer 3

cos90度=0
sin90度=1

Answer 4

cos90°=0
sin90°=1

Answer 5

sin度=1，cos度=0.