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Sep
27
answered What is the proof of $n^2 = 1 + 3 + 5 … (2*n - 1)$
Sep
27
comment 1/x+1/y=1/2004. How to solve this one?
@JackiePoehler, $$2004^2=2^43^2167^2,\implies$$ the number of positive divisors is $$(4+1)(2+1)(2+1)=45$$
Sep
27
comment 1/x+1/y=1/2004. How to solve this one?
@ThomasAndrews, Though its should not be tough to relate $n$ with $2004$ from the last line of the Question, still I've added a line for the sake of completeness
Sep
27
revised 1/x+1/y=1/2004. How to solve this one?
added 35 characters in body
Sep
27
answered 1/x+1/y=1/2004. How to solve this one?
Sep
27
comment Integrating $\displaystyle\int_0^{\pi/2} {\sin^2x \over 1 + \sin x\cos x}dx$
@Masroor, As suggested by Rohinb97
Sep
27
answered Integrating $\displaystyle\int_0^{\pi/2} {\sin^2x \over 1 + \sin x\cos x}dx$
Sep
27
comment Prove identity based on binomial theorem
math.stackexchange.com/questions/941857/…
Sep
26
revised Sum algorithm problem
added 25 characters in body
Sep
26
answered Sum algorithm problem
Sep
26
answered Question analysis so amazing
Sep
26
comment Simplifying a summation involving “cos”.
@Niharika, Please find my answer
Sep
26
answered Simplifying a summation involving “cos”.
Sep
26
answered reducing exponent in modular arithmetic
Sep
26
revised Divisibility by 7 of a number
added 243 characters in body
Sep
26
answered Divisibility by 7 of a number
Sep
26
comment Nice Question in Mathmatics about Times
@egreg, Using en.wikipedia.org/wiki/Carmichael_function, $$\lambda(168)=\cdots=6$$
Sep
26
comment Simplifying a summation involving “cos”.
Then use math.stackexchange.com/questions/117114/…
Sep
26
comment How $\sqrt{\cos (106.3) + i \sin (106.3)} = \cos 53.15 + i \sin 53.15$
@problematic, I think the mink is sufficient, you are free to write one & accept that
Sep
26
comment How $\sqrt{\cos (106.3) + i \sin (106.3)} = \cos 53.15 + i \sin 53.15$
en.wikipedia.org/wiki/De_Moivre%27s_formula