Message Error “First input argument must be a function handle”

2020 1 2
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更新时间：2020 1 16
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When trying to calculate the Integral of two variables, I faced the Error:
“First input argument must be a function handle”
Here is the code:
syms x;
a=0.4;
theta=(9 - 4*x*(5*x - 141/25))^(1/2)/2 - 3/2;
theta_prime=-(40*x - 564/25)/(4*(9 - 4*x*(5*x - 141/25))^(1/2));
g=(1/theta)*theta_prime
s=(1+a*(theta-1))*(g)^2
sgen = integral(s,x,0.1,1) %x=0.1:0.1: 1
What was my mistake? Please help.

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Walter Roberson
Walter Roberson 2020-1-2

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integral() is for numeric integration. You need int() for symbolic integration

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