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 Dec10 awarded Caucus Oct6 awarded Yearling Sep30 awarded Explainer Sep27 revised Did I find the period of $\sqrt{1-\sin^2x}$ correctly? added 1 character in body Sep27 reviewed Approve Did I find the period of $\sqrt{1-\sin^2x}$ correctly? Sep16 revised Find the Domain of the function: $f(x) = \frac{x^2+2x+3 }{ x^2 -9}$ added 9 characters in body Jul12 answered Find $M > 0$ that for every $x > M$, we get ${{x^2 - 2x} \over {x + 2 \cos x}} >1000$ Jul6 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). Jul6 answered Proving logical equivalence Jul2 awarded Curious Jun22 answered Proposed proof of set theoretic result Jun16 revised HARD Arithmetic Progression Problem added 7 characters in body Jun16 revised HARD Arithmetic Progression Problem added 330 characters in body Jun16 answered HARD Arithmetic Progression Problem Jun14 answered Find the intersections of the functions Jun14 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. Jun14 answered why$(\forall x \in U, P(x)) \implies (\exists x \in U, P(x))$ is false? Jun12 answered Ice Cream Combinatorics Jun12 awarded Nice Answer Jun12 answered How many permutations of all the letters in the word ARMADILLO begin with letter A?