Expression 4: "y" equals "F" left parenthesis, "x" minus "t" , right parenthesis plus "G" left parenthesis, "x" plus "t" , right parenthesisy=Fx−t+Gx+t
4
Expression 5: "y" equals "F" left parenthesis, "x" minus "t" , right parenthesis plus 1.5y=Fx−t+1.5
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Expression 6: "y" equals "G" left parenthesis, "x" plus "t" , right parenthesis minus 1.5y=Gx+t−1.5
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Expression 7: "g" left parenthesis, "x" , right parenthesis equals hyperbolic secant left parenthesis, "x" , right parenthesis squaredgx=sechx2