Well you've lost me. I even tried saying them out loud in an American accent (I'm British). Still nothing. Them seem to rely on some word that sounds a bit like owl. Obviously, it won't be funny if you have to explain it, but I'm curious nevertheless.
"Owlelephant sin(theta)" tells you that "owl cross elephant" means the cross product of two 3-D vectors. Cross product requires that both operands are vectors: you cannot calculate a cross product if an operand is scalar (not a vector), which sounds like scaler (someone who scales mountains). The punchline recalls learning about cross products in maths class, where the instructor kept saying "you can't calculate A x b because b is scalar".
I particularly like the joke because it combines two genres: math jokes and elephant jokes. However, it does have a limited audience and I had to have it explained to me the first time too.
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