수식 3: "f" left parenthesis, "x" , right parenthesis equals left parenthesis, StartFraction, left parenthesis, cos left parenthesis, "x" , right parenthesis ln left parenthesis, "x" , right parenthesis , right parenthesis Over "x" , EndFraction minus StartFraction, cos left parenthesis, "x" , right parenthesis log Subscript, 10 , Baseline left parenthesis, "x" , right parenthesis Over ln left parenthesis, ln left parenthesis, "x" , right parenthesis , right parenthesis , EndFraction , right parenthesis Superscript, cos left parenthesis, "x" , right parenthesis , Baselinefx=cosxlnxx−cosxlog10xlnlnxcosx
3
수식 4: "f" left parenthesis, StartFraction, pi Over 2 , EndFraction plus pi "n" , right parenthesisfπ2+πn