MATLAB: Error using fprintf Unable to convert ‘sym’ value to ‘double’. Error in Untitled (line 14) fprintf(‘Taylor series approximation = %.7g \n’,approx)

Question

syms x
f = x^5;
fprintf('Taylor series of x^5 \n');
N = input('Enter the number of terms in the expansion:  ');
a = input('Enter the value of a to  expand around taylor expansion: ');
approx = 0;
for n=0:N-1
    approx = approx + (1-a)^n * diff(f,n) / factorial(n); 
end
fprintf('\n')
fprintf('Taylor series approximation = %.7g \n',approx)
fprintf('actual value = %.7g \n',x^5);
fprintf('error = %.3g \n',approx-x^5);

Answer 1

'%s'
doc fprintf