Mathematicians once turned up their noses at imaginary numbers. But complex analysis actually simplifies math and physics.

The square root of 2025 is 45. The divisors of 45 (apart from 45 itself) are 1, 3, 5, 9 and 15. The product of these numbers ...

Which is 9. So 9 is a square number. Here are some other examples of square numbers. Can you see how all these numbers can be arranged into a square? Which is 64. So 64 is a cube number.

Then take the square root. Consider the pulse train example ... there is a propensity for spewing off numbers without thinking about what they mean. In this case, saying that an AC voltage ...

Which is 9. So 9 is a square number. Here are some other examples of square numbers. Can you see how all these numbers can be arranged into a square? Which is 64. So 64 is a cube number.

Put simply, standard deviation measures how far apart numbers are in a data set. This metric is calculated as the square root of the variance. This means you have to figure out the variation ...