表达式2: "C" equals left parenthesis, cos left parenthesis, "t" , right parenthesis , 5 plus sin left parenthesis, "t" , right parenthesis , right parenthesisC=cost,5+sint
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
2
表达式3: "S" equals left parenthesis, "t" , sin left parenthesis, "t" , right parenthesis , right parenthesisS=t,sint
定义域t最小值： negative 2 pi−2π
less than or equal to "t" less than or equal to≤t≤
