Rationalizing denominator - why?
50905
Why rationalize the denominator?
148393
Intuition to the Resolution of a fractional factorial design
141273
When is $\sin(x)$ rational?
65300
Why is $\pi$ irrational?
95637
Justifying Calculations on $f(n)=\frac{1}{2 \pi}\int_{-\pi}^{\pi}\theta e^{-in \theta} d \theta$
35794
Why does synthetic division work?
37642
Why is $\pi$ irrational if it is represented as $C/D$?
75831
Inconsistency in divide-by-zero behavior between different value types
49984
Valid justification for algebraic manipulation of $\mathrm{d}y/\mathrm{d}x$?
39457
Why is \[ ... \] preferable to $$ ... $$?
50230
Why does the order of summation of the terms of an infinite series influence its value?
132264
Is there a (basic) way to understand why a limit cannot be brought inside of a sum, in certain situations?
12010
Integration by partial fractions; how and why does it work?
43226
Intuition behind logarithm inequality: $1 - \frac1x \leq \log x \leq x-1$
19561
Why is $\frac{1}{\frac{1}{X}}=X$?
151582
Why is it rational to pay out a dividend?
134264
How to get exact Rationalize of a decimal number?