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age 14
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I'm a perfect example of a n00b.


Sep
17
reviewed Reviewed Formulas for finding out if a number is Heptagonal or Octagonal
Sep
17
awarded  Scholar
Sep
17
accepted Summation of a finite series involving permutations.
Sep
16
comment Trigonometry: Solve equation for $\alpha$
@Gigili luckily, I typed it a minute before you :)
Sep
16
comment Trigonometry: Solve equation for $\alpha$
Hint: you will require the following identities.$$ \sin(\alpha + \beta) = \sin\alpha \cos \beta + \sin \beta \cos \alpha \cdots(1)$$ $$ \sin(2\alpha) = 2\sin\alpha\cos a\cdots(2) $$ $$\sin(\alpha - \beta) = \sin\alpha \cos\beta - \sin\beta\cos\alpha\cdots(3)$$Note that there are a lot of solutions for this equation, so these identities will just help you to simplify, since the solutions cannot be found without technology.
Sep
16
revised Drawing sine and cosine waves
Major edit!
Sep
16
awarded  Student
Sep
16
comment Summation of a finite series involving permutations.
That was very good. Thanks, I can do the rest :)
Sep
16
comment Summation of a finite series involving permutations.
Yes,$$ P(i,2) = {i! \over (i - 2)!}$$ Second involves the sum of an arithmetic sequence.$${n(n + 1) \over 2}$$Third:$${n(n + 1)(2n + 1)\over 6} $$
Sep
16
asked Summation of a finite series involving permutations.
Sep
15
awarded  Editor
Sep
15
revised Drawing sine and cosine waves
Pi/2 radians
Sep
15
awarded  Supporter
Sep
15
answered Drawing sine and cosine waves
Sep
15
comment Basic algebra but can't get answer that fits
Thank you very much! This was comparatively an easy problem, thus making me have a go at it.
Sep
15
awarded  Teacher
Sep
15
answered Basic algebra but can't get answer that fits
Jul
4
answered How to show that $0 \times 2 = 0$?