Angle of Complex Number

### Problem Statement  
Write a Python function `angle_of_complex(real, imag)` that calculates the angle (or phase) of a complex number given its real and imaginary parts. The angle should be returned in radians.  

The angle of a complex number \( z = a + bi \) is defined as the angle \( \theta \) between the positive real axis and the line representing the complex number in the complex plane. This can be calculated using the `cmath.phase` function.  

### Example Usage  
```python [main.nopy]
angle = angle_of_complex(1, 1)
print(angle)  # Expected output: 0.7853981633974483 (approximately π/4)

angle = angle_of_complex(0, 1)
print(angle)  # Expected output: 1.5707963267948966 (approximately π/2)

angle = angle_of_complex(-1, -1)
print(angle)  # Expected output: -2.356194490192345 (approximately -3π/4)
```

import cmath

def angle_of_complex(real, imag):
    """
    Calculate the angle (phase) of a complex number given its real and imaginary parts.

    Args:
        real (float): The real part of the complex number.
        imag (float): The imaginary part of the complex number.

    Returns:
        float: The angle (in radians) of the complex number.
    """
    # Create the complex number from real and imaginary parts
    # Use cmath.phase to calculate the angle
    pass  # Replace this with the actual implementation

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Intermediate math functions

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