Rationalizing the denominator
48716
Evaluating the limit of $\lim_{x \to 9} \frac {x-9} {\sqrt{x} - 3}$
13263
A Pronominal Proposal
34315
Rational, integers and probability
108155
How can we justify the use of logic?
31089
Differentiating expressions with division in them
10647
Intuition for why the sum of Bernoulli trials is a sufficient statistic via cancellations on numerator and denominator?
103055
Proving the quotient rule for limits
141273
When is $\sin(x)$ rational?
102420
How to prove that adding $n$ to the numerator and denominator will move the resultant fraction close to $1$?
83913
Rational solutions of Pell's equation
44154
General rule for partial fraction decomposition
95637
Justifying Calculations on $f(n)=\frac{1}{2 \pi}\int_{-\pi}^{\pi}\theta e^{-in \theta} d \theta$
9118
Polynomial division: an obvious trick? [reducing mod $\textit{simpler}$ multiples]
75141
Quotient-Remainder Theorem Proving
151650
An article before the word "Equation"
40048
Finding the fallacy in this broken proof
28230
What bizarrities lurk within the decimal expansion of an irrational number?