Coffeehouse Post

Single Post Permalink

View Thread: Math Quiz: 9 is number one
  • User profile image
    iStation

    brianbec said:
    iStation said:
    *snip*

    Nice one. Here's another

     

    Find the first positive real value of t for which the following is zero

     

    256 cos^9(pi t / 162) - 576 cos^7(pi t / 162) + 432 cos^5(pi t / 162) -120 cos^3(pi t/162) + 9 cos(pi t / 162)

    Wow!

     

    9! Right? [27, 45, 63, 81, 99....]

     

    How about this one?

     

    + ∞
    ∫ [{sin(9x)}/x]dx = ?
    − ∞