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Question: Error, (in fprintf) number expected for floating point format

Question:Error, (in fprintf) number expected for floating point format

Aegis07 10 Maple
October 31 2019
2

I am trying to export the data list to .dat but i received that error. New with coding and Maple.

restart;
a := sin(x^(1/3))+sin(x)^(1/3);
                      / (1/3)\         (1/3)
                   sin\x     / + sin(x)     
b := diff(a, x);
                     / (1/3)\                
                  cos\x     /      cos(x)    
                  ----------- + -------------
                      (2/3)             (2/3)
                   3 x          3 sin(x)     
output := fopen("Ospino.dat", WRITE);
for x by .5 to 50 do fprintf(output, "%f\t %f\t \n", x, b) end do;
Error, (in fprintf) number expected for floating point format
fclose(output);
 
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