表达式3: left parenthesis, StartRoot, 0.1 , EndRoot cos "t" plus cos left parenthesis, "a" plus pi , right parenthesis , StartRoot, 0.1 , EndRoot sin "t" plus sin left parenthesis, "a" plus pi , right parenthesis , right parenthesis0.1cost+cosa+π,0.1sint+sina+π
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
3
表达式4: left parenthesis, "x" minus cos "a" , right parenthesis squared plus left parenthesis, "y" minus sin "a" , right parenthesis squared less than or equal to 0.1x−cosa2+y−sina2≤0.1
