Reputation
15,248
Top tag
Next privilege 20,000 Rep.
Access 'trusted user' tools
Badges
2 13 32
Newest
 Tumbleweed
Impact
~230k people reached

Jan
24
answered Given the time complexity, determine how many problem instances can be solved in one minute
Jan
22
comment Limit $\lim_{x \to 1} \frac{\log{x}}{x-1}$ without L'Hôpital
why is the last step obvious -- you have a 0/0 form?
Jan
22
comment Limit $\lim_{x \to 1} \frac{\log{x}}{x-1}$ without L'Hôpital
@hardmath you only need up to the quadratic term. The OP was not interested in minimizing the number of derivatives, just in avoiding to use L'Hospital's rule...
Jan
22
answered Limit $\lim_{x \to 1} \frac{\log{x}}{x-1}$ without L'Hôpital
Jan
22
comment infinite sum of the sequences
@ClementC. makes sense, did not think about it
Jan
21
comment infinite sum of the sequences
@AndréNicolas how does it help? power of $t$ in $\cosh$ expansion coincides with the factorial term, here is it a half of that
Jan
21
comment Given the real number $t = - \frac 5 4 \pi$, give the values of the sine, cosine and tangent.
Since sine, cosine and tangent have the same values on each interval of length $2\pi$, finding these at $-5\pi/4$ is the same as at $-5\pi/4+2\pi = 3\pi/4$. Can you do this now?
Jan
19
revised Prime and Repunits
deleted 8 characters in body
Jan
19
comment Calculate the Integral $\int _0^{\frac{\pi }{2}}\:\frac{\sin^{7/2}x}{\sin^{7/2}x+\cos^{7/2}x}dx$
@Noam $$\frac{s}{s+c} + \frac{c}{s+c} = 1$$
Jan
19
revised Calculate the Integral $\int _0^{\frac{\pi }{2}}\:\frac{\sin^{7/2}x}{\sin^{7/2}x+\cos^{7/2}x}dx$
deleted 21 characters in body; edited tags
Jan
19
comment Upper estimate of integral
edited to the best of ability, please double check
Jan
19
revised Upper estimate of integral
added 42 characters in body
Jan
19
comment How to approximate linear relationship between two timeseries?
Could the one who downvoted please explain the downvote? The OP explicitly asked for a Excel/Matlab solution...
Jan
19
revised How to approximate linear relationship between two timeseries?
deleted 2 characters in body
Jan
19
revised How to approximate linear relationship between two timeseries?
added 180 characters in body
Jan
19
answered How to approximate linear relationship between two timeseries?
Jan
19
revised What are the prerequisites for learning linear algebra
edited tags
Jan
19
answered For how many pairs of distinct positive integers $a$ and $b$, both less than $100$, is $\dfrac{a}{b}$ the square of an integer?
Jan
19
answered Calculate an integral
Jan
19
revised How to evaluate a limit with an inverse of a sum
added 4 characters in body