Unrecognized function or variable

I am trying to solve for T2 when the equation is equal to zero but it doesn't work, can someone help please?

function assignment8

Hreaction=-802310;

T1=25+275.15;

T2=solve(-Hreaction-(integral(@(T)cpCO2(T),T2,T1)-2*integral(@(T)cpH2Og(T),T1,T2)-0.6*integral(@(T)cpCO2(T),T2,T1)==0)); %J/mol

return

function cp=cpH2Og(T)

% Ideal-gas heat capacity (J/(molK)) for H2O with T in K % Source: GVR

% Appendix 3

a=3.40471e1;

b=-9.65064e-3;

c=3.2998e-5;

d=-2.04467e-8;

e=4.30228e-12;

cp=a+b*T+c*T.^2+d*T.^3+e*T.^4;

return

function cp=cpCO2(T)

% Ideal-gas capacity (J/(molK)) for CO2 with T in K % Source: GVR

% Appendix 3

a=1.90223e1;

b=7.96291e-2;

c=-7.37067e-5;

d=3.74572e-6;

e=-8.13304e-12;

cp=a+b*(T)+c*(T).^2+d*(T).^3+e*T.^4;

return

function cp=cpO2(T)

% Ideal-gas capacity (J/(molK)) for CO2 with T in K % Source: GVR

% Appendix 3

a=2.98832e1;

b=-1.13842e-2;

c=4.33779e-5;

d=-3.70082e-8;

e=1.01006e-11;

cp=a+b*(T)+c*(T).^2+d*(T).^3+e*T.^4;

return