Added output to math exercise

exercises/math/out.txt

+Gamma function of 5 = 24
+Bessel function of 0.5 = 0.242268
+Square root of -2 = 0 + 1.41421i
+e to the power i*pi = -1 + 2.89542e-16i
+e to the power i = 0.540302 + 0.841471i
+i to the power e = -0.42822 + -0.903675i
+i to the power i = 0.20788 + 0i
+The precision of different variable types:
+Float: 0.1111111119389533996582031
+Double: 0.1111111111111111049432054
+Long double: 0.1111111111111111111096053