Complex numbers

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• [x] Addition
• [x] Subtraction
• [x] Multiplication
• [ ] Polar form conversion
• [ ] Polar form operations
• [ ] nth root of unity

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It's currently handled through python's operations, so nothing complex can be done, and the j notation should be used.

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Because of the use of NumPy it is possible to do some advanced operations like sin(1j). Despite that, I didn't test nth root of unity yet.