foo.cc:9:24: error: extended character − is not valid in an identifier
    9 |                 f[i]=f[i−1]∗(4∗i−2)/(i+1);
      |                        ^
foo.cc:9:28: error: extended character ∗ is not valid in an identifier
    9 |                 f[i]=f[i−1]∗(4∗i−2)/(i+1);
      |                            ^
foo.cc:9:30: error: extended character ∗ is not valid in an identifier
    9 |                 f[i]=f[i−1]∗(4∗i−2)/(i+1);
      |                              ^
foo.cc:9:30: error: extended character − is not valid in an identifier
foo.cc: In function ‘int main()’:
foo.cc:9:24: error: ‘i−1’ was not declared in this scope
    9 |                 f[i]=f[i−1]∗(4∗i−2)/(i+1);
      |                        ^~~

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