add some variation of Logarithmic function

02_Day_Data_types/02_day_data_types.md

@@ -231,7 +231,16 @@ console.log(Math.E)             // 2.718
 console.log(Math.log(2))        // 0.6931471805599453
 console.log(Math.log(10))       // 2.302585092994046
 
+// Returns the natural logarithm of 2 and 10 respectively
+console.log(Math.LN2)           // 0.6931471805599453
+console.log(Math.LN10)          // 2.302585092994046
+
+// Returns the natural logarithm with base 10 of x, Math.log10(x)
+console.log(Math.log10(2))        // 0.3010299956639812
+console.log(Math.log10(10))       // 1
+
 // Trigonometry
+// Returns the value in radians
 Math.sin(0)
 Math.sin(60)