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Tag: prove

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  1. Prove that sin(x)+cos(x) is equal or larger than 1

    Started by Yankel, January 10th, 2017 05:22
    2 Pages
    1 2
    assume, contradiction, inequality, prove, [sin^2x-2sinxcosx+cos^2x
    • Replies: 11
    • Views: 281
    Last Post: January 15th, 2017 13:44
    by I like Serena  Go to last post

    Forum:
    Trigonometry

  2. property of multiple of 2016

    Started by vidyarth, January 4th, 2017 06:53
    2016, exact, ideas, multiple, prove
    • Replies: 6
    • Views: 159
    Last Post: January 7th, 2017 02:29
    by vidyarth  Go to last post
  3. 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: 154
    Last Post: January 5th, 2017 04:49
    by Opalg  Go to last post
    • Replies: 2
    • Views: 89
    Last Post: January 1st, 2017 02:33
    by Albert  Go to last post
  4. sum of 100 terms (continued)

    Started by Albert, December 29th, 2016 20:33
    equal, numbers, prove, terms, test
    • Replies: 3
    • Views: 129
    Last Post: December 31st, 2016 17:27
    by Saknussemm  Go to last post
  5. Sum of a hundred terms

    Started by anemone, December 21st, 2016 12:45
    $a_1, a_100$, a_2, cdots, equal, hundred, numbers, prove
    • Replies: 6
    • Views: 241
    Last Post: December 29th, 2016 09:02
    by anemone  Go to last post
  6. prove all a_ns are integers

    Started by Albert, December 25th, 2016 23:32
    a_n, integer$, prove, term
    • Replies: 2
    • Views: 85
    Last Post: December 26th, 2016 13:42
    by Albert  Go to last post
  7. Prove 1 ≤ x+y+z ≤ 2

    Started by anemone, December 11th, 2016 00:12
    $1le, $xy+yz+zx=1$, 1]$, prove, x^2+y^2+z^2le
    • Replies: 6
    • Views: 208
    Last Post: December 14th, 2016 11:36
    by kaliprasad  Go to last post
  8. Prove that PQR is isosceles?

    Started by woof123, December 7th, 2016 00:11
    • Replies: 4
    • Views: 131
    Last Post: December 10th, 2016 08:29
    by mathlearn  Go to last post

    Forum:
    Geometry

  9. Proving determinant

    Started by MaryAnn, November 23rd, 2016 23:06
    $deta, 4k$, entries, hand, prove
    • Replies: 4
    • Views: 165
    Last Post: November 26th, 2016 11:08
    by MaryAnn  Go to last post
  10. Nine-Point Circle

    Started by pholee95, November 14th, 2016 20:18
    • Replies: 1
    • Views: 129
    Last Post: November 15th, 2016 21:14
    by greg1313  Go to last post

    Forum:
    Geometry

  11. Problem of the week #240 Nov 5th, 2016

    Started by anemone, November 5th, 2016 03:30
    $xyzle, $x^2+y^2+z^2+xyz=4$, potw, prove, read
    • Replies: 1
    • Views: 144
    Last Post: November 12th, 2016 12:16
    by anemone  Go to last post
  12. Problem of the week #238 Oct 20th, 2016

    Started by anemone, October 20th, 2016 12:48
    potw, prove, read, remember, submission
    • Replies: 1
    • Views: 212
    Last Post: October 29th, 2016 00:38
    by anemone  Go to last post
  13. Proving Scalar Product

    Started by Tarrant, October 27th, 2016 18:08
    $langle, product, prove, scalar, xrangle
    • Replies: 1
    • Views: 103
    Last Post: October 27th, 2016 23:07
    by GJA  Go to last post
    • Replies: 3
    • Views: 207
    Last Post: October 26th, 2016 23:41
    by kaliprasad  Go to last post
  14. using trigonometry to prove <c=50 degree

    Started by Albert, October 22nd, 2016 09:50
    prove, trigonometry
    • Replies: 1
    • Views: 97
    Last Post: October 23rd, 2016 00:04
    by kaliprasad  Go to last post
  15. Prove, that a is an integer

    Started by lfdahl, October 16th, 2016 14:04
    2 Pages
    1 2
    find, mathbbz], mod, prove, [ain
    • Replies: 10
    • Views: 382
    Last Post: October 21st, 2016 14:45
    by lfdahl  Go to last post
  16. Piecewise limits

    Started by Harambe, October 17th, 2016 17:46
    contradiction, exist, limit, mathbbq, prove
    • Replies: 2
    • Views: 182
    Last Post: October 18th, 2016 03:48
    by Opalg  Go to last post

    Forum:
    Calculus

  17. prove inequality

    Started by Albert, October 7th, 2016 09:49
    $1+a1+b1+cgeq, 1+a+b+c$, cgeq1$, inequality, prove
    • Replies: 1
    • Views: 113
    Last Post: October 7th, 2016 12:07
    by Euge  Go to last post
  18. Prove that triangle BAD is isosceles and....

    Started by mathlearn, October 3rd, 2016 21:20
    • Replies: 4
    • Views: 211
    Last Post: October 5th, 2016 23:10
    by mathlearn  Go to last post

    Forum:
    Geometry

  19. Prove congruence for powers of 2

    Started by Alexmahone, October 2nd, 2016 13:36
    $a^n/4equiv, $phin=n/2$, 1pmodn$, eulers, prove
    • Replies: 3
    • Views: 187
    Last Post: October 3rd, 2016 16:20
    by caffeinemachine  Go to last post
  20. Determinant of matrix with Aij = min(i, j)

    Started by nedf, October 2nd, 2016 12:12
    ann, determinant, matrix, prove, term
    • Replies: 3
    • Views: 145
    Last Post: October 2nd, 2016 12:55
    by Evgeny.Makarov  Go to last post
  21. Polynomial inequality

    Started by lfdahl, September 22nd, 2016 16:56
    $n$, polynomial, prove, real, roots
    • Replies: 7
    • Views: 313
    Last Post: September 29th, 2016 03:33
    by kaliprasad  Go to last post
  22. prove relationship between sets

    Started by biocamme, September 21st, 2016 20:38
    a∩b^c=a^c∪b^c, a∪b^c=a^c∩b^c, prove, sets, relationship
    • Replies: 4
    • Views: 246
    Last Post: September 27th, 2016 19:40
    by HallsofIvy  Go to last post
  23. Prove that center of DG = center of the red circle.

    Started by maxkor, September 25th, 2016 15:00
    • Replies: 1
    • Views: 104
    Last Post: September 25th, 2016 16:34
    by Opalg  Go to last post

    Forum:
    Geometry

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