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 Oct 6 awarded Yearling Jul 12 awarded Revival Dec 10 awarded Caucus Oct 6 awarded Yearling Sep 30 awarded Explainer Sep 27 revised Did I find the period of $\sqrt{1-\sin^2x}$ correctly? added 1 character in body Sep 27 reviewed Approve Did I find the period of $\sqrt{1-\sin^2x}$ correctly? Sep 16 revised Find the Domain of the function: $f(x) = \frac{x^2+2x+3 }{ x^2 -9}$ added 9 characters in body Jul 12 answered Find $M > 0$ that for every $x > M$, we get ${{x^2 - 2x} \over {x + 2 \cos x}} >1000$ Jul 6 comment Proving logical equivalence @Guest For the first equivalence, I used the distributive law while for the second, I used the fact that $P\land \text{ tautology}\equiv P$ (since $R\lor\neg R$ is a tautology). Jul 6 answered Proving logical equivalence Jul 2 awarded Curious Jun 22 answered Proposed proof of set theoretic result Jun 16 revised HARD Arithmetic Progression Problem added 7 characters in body Jun 16 revised HARD Arithmetic Progression Problem added 330 characters in body Jun 16 answered HARD Arithmetic Progression Problem Jun 14 answered Find the intersections of the functions Jun 14 comment why$(\forall x \in U, P(x)) \implies (\exists x \in U, P(x))$ is false? @yunichanyeol Yes, it is a definition. But you should convince yourself that both these definitions make intuitive sense. Jun 14 answered why$(\forall x \in U, P(x)) \implies (\exists x \in U, P(x))$ is false? Jun 12 answered Ice Cream Combinatorics