lolleep

#include <iostream>

double myAtan(const double x){
	double un = x, sum = 0, temp = x;
	int k = 1;

	while(abs(un) >= 0.000000595){
		sum += un;
		temp = temp * x * x;
		un = temp / (2 * k + 1);
		if(k % 2 != 0) un *= -1;
		++k;
	}
	return sum;
}

double myCos(const double x){


}



int main(){

	std::cout << myAtan(0.935);


	return 0;
}