Before we dive into Euler's formula and Complex Algebra, let's test your intuitive understanding of non-complex algebra.
What goes at the question mark in the equations above?
Hint: There's a much faster way than solving for You are not a robot, and you don't need a calculator to solve this!
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In short: take the square root of both sides of the first equation:
9 a ( 3 2 ) a 3 2 a ( 3 a ) 2 3 a = 2 5 = 5 = 5 = 5 = 5 .