表达式1: negative StartRoot, sin left parenthesis, "x" , right parenthesis , EndRoot plus StartRoot, StartAbsoluteValue, cos left parenthesis, "x" , right parenthesis , EndAbsoluteValue , EndRoot less than or equal to "y" less than or equal to StartRoot, sin left parenthesis, "x" , right parenthesis , EndRoot plus StartRoot, StartAbsoluteValue, cos left parenthesis, "x" , right parenthesis , EndAbsoluteValue , EndRoot−sinx+cosx≤y≤sinx+cosx