Expression 1: 2 left parenthesis, 1 , right parenthesis left parenthesis, StartFraction, sin left parenthesis, 0.6 "x" plus 2.5 "t" , right parenthesis plus 1 Over 2 , EndFraction , right parenthesis to the 5th power plus 2 left parenthesis, 0.8 , right parenthesis left parenthesis, StartFraction, sin left parenthesis, 0.7 "x" plus 1.2 "t" , right parenthesis plus 1 Over 2 , EndFraction , right parenthesis cubed positive 2 left parenthesis, 0.4 , right parenthesis left parenthesis, StartFraction, sin left parenthesis, 0.4 "x" plus 1.2 "t" , right parenthesis plus 1 Over 2 , EndFraction , right parenthesis to the 1st power21sin0.6x+2.5t+125+20.8sin0.7x+1.2t+123+20.4sin0.4x+1.2t+121