수식 1: "f" left parenthesis, "x" , right parenthesis equals sine left parenthesis, StartFraction, pi Over 2 , EndFraction cos "x" , right parenthesisfx=sinπ2cosx
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수식 2: "g" left parenthesis, "x" , right parenthesis equals cosine left parenthesis, StartFraction, pi Over 2 , EndFraction sin "x" , right parenthesisgx=cosπ2sinx