表达式8: 2 left parenthesis, negative 3 plus cos left parenthesis, "t" , right parenthesis , 2 plus sin left parenthesis, "t" , right parenthesis , right parenthesis left brace, sin left parenthesis, 20 "t" , right parenthesis greater than 0 , right brace2−3+cost,2+sintsin20t>0
00
定义域t最小值：
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： 2 pi2π
8
表达式9: 2 left parenthesis, cos left parenthesis, "t" , right parenthesis , 2 plus sin left parenthesis, "t" , right parenthesis , right parenthesis left brace, sin left parenthesis, 20 "t" minus "T" , right parenthesis greater than 0 , right brace2cost,2+sintsin20t−T>0
00
定义域t最小值：
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： 2 pi2π
9
表达式10: 2 left parenthesis, 3 plus cos left parenthesis, "t" , right parenthesis , 2 plus sin left parenthesis, "t" , right parenthesis , right parenthesis left brace, sin left parenthesis, 20 "t" plus pi "T" Subscript, 2 , Baseline , right parenthesis greater than 0 , right brace23+cost,2+sintsin20t+πT2>0
定义域t最小值： 00
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： 2 pi2π
10
隐藏 标签 2 left parenthesis, 6 plus cos left parenthesis, "t" , right parenthesis , 2 plus sin left parenthesis, "t" , right parenthesis , right parenthesis left brace, "T" Subscript, 2 , Baseline greater than 0 , right brace 有图表。26+cost,2+sintT2>0
