如题所述
#include <stdio.h>
main()
{
printf("%.6f", acos(0.0));
}追é®
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cos (Ï/2) = 0
Ï/2 = acos(0.0)
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#include
#include
#define JD 1e-6
int main()
{
double i = 1.0;
double sign = 1.0;
double ans = 0.0;
double term;
do
{
term= 2 * sign / i;
ans += term;
i += 2;
sign*=- 1;
} while (fabs(term) > JD);
printf("%.6f", ans);
}
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term= 2 * sign / i;
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term= 4 * sign / i;
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pi = 4/1 - 4/3 + 4/5 - 4/7 + 4/9 - 4/11 ...
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pi = 8/(1*3)+ 8/(5*7)+ 8/(9*11)
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