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Mathematics
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Two identity problems
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Is 9 a and.. is 10 d?
You'll have to prove them or disprove them. A simple method to rule things out is to try something, maybe 0. If it doesn't work, you are done with that one.
I like the tip that @tkhunny gave for speed. I'm guessing that you worked on these already @Exvikki, because I got the same answers.
9 is a
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