Aside from the 2 trivial answers, 0000x0=0000 and 1111x1=1111, there is one other answer. 1089*9=9801.
You find C & E pretty quickly, as running through the digits 2-9 yields either impossible situations or results exceeding 4 digits. It takes similar trial and error to deduce the other two digits such that it works out.
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When x = 3.806663, tan(e^x) = 1.
it means e = MC2 which is M x c x 2
Question: 2x + e = 5x - 2x 3x = e x = e/3
x = 1/e where e is the base of natural logs.
Ohm's Law is E = I x R