dwarandae
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 6 In calculus, which questions can the naive ask that the learned cannot answer? 3 Logarithm question for Algebra 2/Trig class 2 If $f(x)= \sec x/x$, then $f ' (\pi/3)$= 2 How can I know how many real roots this polynomial has? 1 Proof of the angle sum identity for $\sin$

Reputation (576)

 +20 The existence of the empty set is an axiom of ZFC or not? +15 Prove $\lim_{x \rightarrow 0} \frac {\sin(x)}{x} = 1$ with the epsilon-delta definition of limit. +2 Simplify the expression (combination and factorial) +5 Is there a formula for finding the number of divisors of $n$ without factorize it?

Questions (8)

 26 A limit wrong using Wolfram Alpha 11 The existence of the empty set is an axiom of ZFC or not? 10 Prove $\lim_{x \rightarrow 0} \frac {\sin(x)}{x} = 1$ with the epsilon-delta definition of limit. 1 Is there a formula for finding the number of divisors of $n$ without factorize it? 1 Is the set of lines through the origin equals to $\mathbb{R}^2$?

Tags (25)

 8 calculus × 6 2 polynomials 6 education 2 abstract-algebra 3 logarithms 2 field-theory 2 boolean-algebra × 2 1 algebra-precalculus × 3 2 derivatives 1 arithmetic

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 Stack Overflow en español 700 rep 1422 Mathematics 576 rep 726 Area 51 261 rep 5 English Language Learners 138 rep 4 Stack Overflow 101 rep 12