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- #include <iostream>
- #include <iomanip>
- #include <cmath>
- using std::cout;
- using std::endl;
- using std::setprecision;
- using std::acos;
- int main() {
- long double pi_18 = acos(static_cast<long double>(-1.0));
- cout.precision(18);
- cout << pi_18 << endl;
- }
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