表达式4: left parenthesis, negative "t" sin left parenthesis, "a" , right parenthesis , negative "t" cos left parenthesis, "a" , right parenthesis , right parenthesis−tsina,−tcosa
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： 1010
4
表达式5: left parenthesis, "t" cos left parenthesis, "a" , right parenthesis , "t" sin left parenthesis, "a" , right parenthesis , right parenthesistcosa,tsina
00
定义域t最小值：
less than or equal to "t" less than or equal to≤t≤
