수식 3: "x" squared times cosine left parenthesis, StartFraction, 1 Over "x" , EndFraction , right parenthesisx2·cos1x
3
수식 4: left parenthesis, "a" , "a" squared cos left parenthesis, StartFraction, 1 Over "a" , EndFraction , right parenthesis , right parenthesisa,a2cos1a