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How to solve "invalid type for binary expression: double* function returning double"?

hi friends

I write this UDF to represent unsteady heat flux, but an error appear, I can not understand how to solve it in the 13th line.

Error: line 13: invalid type for binary expression: double * function returning double.

Code:

#include "udf.h"

DEFINE_PROFILE(unsteady_flux, thread, position)

{

face_t f;

real t = CURRENT_TIME;

real Trise = 0;

real Tset = 48600;

real Tmax = 21900;

real Gs = 500;  

begin_f_loop(f, thread)

{ 

if((temp>=Trise) && (temp<Tmax)) 

F_PROFILE(f, thread, position) = Gs*sin*(90*(t-Trise)/(Tmax-Trise)); 

else if((temp>=Tmax) && (temp<Tset)) 

F_PROFILE(f, thread, position) = Gs*sin*(90*(t-Tmax)/(Tset-Tmax)); 

} 

end_f_loop(f, thread)

}

You used the sine function wrong, so your code should be:

#include "udf.h"
DEFINE_PROFILE(unsteady_flux, thread, position)
{
face_t f;
real t = CURRENT_TIME;
real Trise = 0.0;
real Tset = 48600.0;
real Tmax = 21900.0;
real Gs = 500.0;
begin_f_loop(f, thread)
{
if((temp>=Trise) && (temp<Tmax))
F_PROFILE(f, thread, position) = Gs*sin(90.0*(t-Trise)/(Tmax-Trise));
else if((temp>=Tmax) && (temp<Tset))
F_PROFILE(f, thread, position) = Gs*sin(90.0*(t-Tmax)/(Tset-Tmax));
}
end_f_loop(f, thread)
}

By the way, I am almost sure that the unit of an angle is radian, not degree. Check it.