To calculate each phase, I need more context. Are you referring to phases in electrical engineering, trigonometry, or a different mathematical concept? It could involve calculations such as:

• Phase difference between waves (trigonometric or complex numbers)
• Phases in a three-phase electrical system
• Phases of a sinusoidal function (angle or time delay)

Could you please clarify which type of phase calculation you're referring to? Feel free to upload any relevant images or equations!

Here are a few potential follow-up questions related to phases:

1. Are you working with AC circuits and need to calculate phase shifts between voltage and current?
2. Do you need to calculate phase angles from complex numbers?
3. Are you analyzing sinusoidal signals for phase differences?
4. Do you need help with three-phase power systems?
5. Is this a question involving phasor diagrams in engineering?

Tip: When calculating phase angles in trigonometry, the inverse tangent function (atan or tan^(-1)) is often used to find the angle between vectors or signals.