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Plot[( -((0.00136053 Cosh[0.0923534 t]^2)/Sinh[0.0923534 t]^(4/3)) + 0.00408158 Sinh[0.0923534 t]^(2/3))/(0.717817 Sinh[0.0923534 t]^(2/3)), {t, 7, 20}]