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+{{keywords>wiki library source code example reference}}
+====== atan2 ======
+<code cpp>
+    double atan2(double , double );
+</code>
+calculates arctangent from 2 numbers
+===== cpp Sourcecode Example =====
+<code cpp>
+#include <iostream> /* including standard library */
+#include <cmath> /* including math library */
+using namespace std;
+int main ( void ){
+    double a=1.2, b=-2.6, res;
+    res = atan2(a, b) * 90 / 3.17;
+    //cout.setf(ios::fixed, ios::floatfield);
+    cout.precision(7);
+    cout << "atan2 from " << a << " and " << b << " is "  << res << endl;
+    return 0;
+}
+</code>
+===== output =====
+    atan2 from 1.2 and -2.6 is 76.91692

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