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Forum: Challenge Questions and Puzzles

Have a challenging question or puzzle you want to share with the community? Post it here (homework questions do NOT belong here).

  1. Sticky Thread Sticky Threads

    • Replies: 1
    • Views: 1,676
    October 8th, 2013, 03:20 Go to last post
  1. Normal Thread Normal Threads

  2. Compute The Limit

    Started by MarkFL, February 26th, 2017 23:47
    compute, dxright, left1+x^nright^n, limit
    • Replies: 4
    • Views: 114
    Today, 05:06 Go to last post
  3. trigonometric inequality challenge

    Started by Albert, February 25th, 2017 07:21
    challenge, cos, inequality, sin, trigonometric
    • Replies: 3
    • Views: 114
    February 26th, 2017, 17:45 Go to last post
  4. find the integer part

    Started by Albert, February 19th, 2017 22:45
    a_n+1=a_n^2+a_n, find, integer, part, sequencea_1=dfrac
    • Replies: 5
    • Views: 179
    February 26th, 2017, 12:07 Go to last post
  5. trigonometry

    Started by kaliprasad, February 1st, 2017 07:41
    $atan, $tanx+y, $tanx-y, show, trigonomerty
    • Replies: 2
    • Views: 166
    February 26th, 2017, 02:50 Go to last post
  6. Prove an inequality

    Started by lfdahl, February 23rd, 2017 15:00
    $sqrt1+sqrt2+sqrt3+, inequality, prove, sqrt2006
    • Replies: 2
    • Views: 92
    February 25th, 2017, 17:19 Go to last post
  7. find tan 15 and cos 72 (using geometry)

    Started by Albert, February 24th, 2017 22:38
    • Replies: 7
    • Views: 119
    February 25th, 2017, 08:09 Go to last post
  8. find (a,b)

    Started by Albert, February 14th, 2017 22:14
    $k=dfrac, ab^2-1a^2b+1in, bin, find
    • Replies: 1
    • Views: 106
    February 17th, 2017, 07:04 Go to last post
  9. pair numbers of (x,y)

    Started by Albert, February 14th, 2017 10:52
    $dfrac, 1201$, 1x+dfrac, 1y=dfrac, test
    • Replies: 2
    • Views: 117
    February 17th, 2017, 02:59 Go to last post
  10. find value(s) of x

    Started by Albert, February 14th, 2017 22:01
    $sqrt, 1x+1+sqrt, find, values, x+dfrac
    • Replies: 3
    • Views: 144
    February 16th, 2017, 09:40 Go to last post
  11. Game on a chessboard

    Started by Evgeny.Makarov, February 14th, 2017 13:25
    game, john, move, peter, squares
    • Replies: 0
    • Views: 41
    February 14th, 2017, 13:25 Go to last post
  12. Find the maximum and minimum

    Started by lfdahl, February 10th, 2017 14:28
    $c$, a-b^3+b-c^3+c-a^3, find, maximum, minimum
    • Replies: 3
    • Views: 132
    February 12th, 2017, 14:51 Go to last post
  13. Product of seven integers

    Started by Evgeny.Makarov, February 8th, 2017 13:58
    integers, numbers, product, resulting, times
    • Replies: 6
    • Views: 155
    February 10th, 2017, 18:00 Go to last post
  14. find value

    Started by Albert, February 7th, 2017 03:42
    $if, find, x+sqrt, x^2+1times, y+sqrt
    • Replies: 1
    • Views: 100
    February 7th, 2017, 18:18 Go to last post
  15. Factoring Algebraic Expression

    Started by anemone, April 24th, 2013 00:28
    • Replies: 4
    • Views: 890
    February 7th, 2017, 09:36 Go to last post
  16. counting

    Started by kaliprasad, November 1st, 2016 08:29
    100, 2016, numbers, primes, show
    • Replies: 1
    • Views: 151
    February 1st, 2017, 07:22 Go to last post
  17. Find the antiderivative

    Started by lfdahl, January 29th, 2017 10:27
    antiderivative, find, [intfrac1x^1/2+x^1/3dx]
    • Replies: 4
    • Views: 211
    January 30th, 2017, 16:00 Go to last post
  18. Trig inequality challenge

    Started by lfdahl, January 19th, 2017 18:51
    cos, fracn2sqrt2], inequality, left, trig
    • Replies: 2
    • Views: 155
    January 28th, 2017, 15:09 Go to last post
  19. prove no common solution

    Started by Albert, January 21st, 2017 21:04
    assume, b2$, common, prove, solution
    • Replies: 2
    • Views: 112
    January 23rd, 2017, 07:30 Go to last post
  20. Differentiation challenge

    Started by Theia, January 19th, 2017 18:06
    differentiation, find, form, fracmathrmdymathrmdx, fracx
    • Replies: 7
    • Views: 286
    January 21st, 2017, 07:05 Go to last post
  21. find angle ADC

    Started by Albert, April 29th, 2016 03:34
    • Replies: 3
    • Views: 312
    January 21st, 2017, 00:57 Go to last post
  22. Area of quadrilateral ABCD

    Started by Albert, January 1st, 2017 00:22
    • Replies: 2
    • Views: 176
    January 16th, 2017, 22:46 Go to last post
    • Replies: 1
    • Views: 158
    January 10th, 2017, 07:28 Go to last post
  23. product with limit

    Started by jacks, December 31st, 2016 14:01
    $displaystyle, evaluate, limit, lim_nrightarrow, product
    • Replies: 2
    • Views: 159
    January 8th, 2017, 07:12 Go to last post
  24. Range of function in [0,1]

    Started by jacks, January 5th, 2017 04:37
    1right]$, frac1+x^0.61+x^0.6;forall, function, left[0, range
    • Replies: 2
    • Views: 141
    January 8th, 2017, 07:07 Go to last post
  25. Prove (x+y+z)+(a+b+c)≥1

    Started by anemone, January 3rd, 2017 11:12
    $a+b+c^2+x+y+z^2ge, numbers, prove, x+y+z+a+b+c≥1, z0$
    • Replies: 4
    • Views: 193
    January 5th, 2017, 04:49 Go to last post
    • Replies: 2
    • Views: 114
    January 1st, 2017, 02:33 Go to last post
  26. Evaluate a sum

    Started by anemone, December 31st, 2016 03:38
    evaluate, frac3n^2+1n^3-n^3, sum, sum_n1
    • Replies: 3
    • Views: 164
    January 1st, 2017, 01:02 Go to last post
  27. sum of 100 terms (continued)

    Started by Albert, December 29th, 2016 20:33
    equal, numbers, prove, terms, test
    • Replies: 3
    • Views: 154
    December 31st, 2016, 17:27 Go to last post
  28. number of real roots in polynomial equation

    Started by jacks, December 30th, 2016 08:11
    0$$, equation, number, real, roots
    • Replies: 3
    • Views: 198
    December 31st, 2016, 11:00 Go to last post
  29. Find the sum of three trigonometric terms

    Started by anemone, December 29th, 2016 10:55
    10^circ+tan^4, 50^circ+tan^4, 70^circ, calculator, evaluate
    • Replies: 2
    • Views: 158
    December 30th, 2016, 13:17 Go to last post

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