수식 4: "f" left parenthesis, "x" , right parenthesis equals arc tangent left parenthesis, tan left parenthesis, StartFraction, pi Over 2 , EndFraction "x" , right parenthesis , right parenthesisfx=arctantanπ2x
4
수식 5: "f" left parenthesis, "x" , right parenthesis equals arc tangent left parenthesis, tan left parenthesis, StartFraction, pi Over 2 , EndFraction , right parenthesis , right parenthesisfx=arctantanπ2