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View Thread: Math Quiz: 9 is number one

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 = ?
− ∞