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The subject I want to talk was shown on the title of the post: Is 0 a perfect square or not? In my view, 0 is a perfect square. What ...

I just want to ask when will Data Structure category come back? Or if it has been closed forever?

It's hard for me to try to prove this inequation. Can anyone do?

Let triangle ABC. a = BC , b = AC, c = AB. Let A, B, C are angle measurements ...

Please reduce the level of Algebra and Number Theory of me from 4 to 3. I can't solve anything at level 4, except first questions, because I do not ...

The problem: Let A be an outside point from the circle with the center O. Draw the secant ABC of the mentioned circle. The tangents at B and C got ...

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