Expression 4: "F" Subscript, "x" , Baseline left parenthesis, "x" , right parenthesis equals Start integral from negative pi to pi , end integral, "f" left parenthesis, "t" , right parenthesis cosine left parenthesis, 2 pi "x" "t" , right parenthesis "d" "t"Fxx=∫π−πftcos2πxtdt
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Expression 5: "F" Subscript, "y" , Baseline left parenthesis, "x" , right parenthesis equals Start integral from negative pi to pi , end integral, "f" left parenthesis, "t" , right parenthesis sine left parenthesis, 2 pi "x" "t" , right parenthesis "d" "t"Fyx=∫π−πftsin2πxtdt
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Expression 6: "F" left parenthesis, "x" , right parenthesis equals StartRoot, "F" Subscript, "x" , Baseline left parenthesis, "x" , right parenthesis squared plus "F" Subscript, "y" , Baseline left parenthesis, "x" , right parenthesis squared , EndRootFx=Fxx2+Fyx2