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  • Otis
    Otis replied to the thread Sin/Cos periodic 2*pi.
    Yes, and we don't need periodicity for that. Many functions output the same value for different inputs. Here's an example: f(x) = x^4 +...
  • H
    HallsofIvy replied to the thread Sin/Cos periodic 2*pi.
    You seem to be completely misunderstanding what a "function" is! You say "isn't [it] necessary for two function like sinx and...
  • B
    Yes, you have to convert the currencies to one standard, because their relative amounts determine the weighting of the average. For...
  • K
    ksdhart2 replied to the thread Match the post#.
    0 + 1 + 234 + 5 \cdot 6 + 789 = 1052 9 \cdot 8 + 7 + 654 + 321 + 0 = 1052
  • D
    Denis replied to the thread Match the post#.
    0! + 123 + 4 \cdot 5 \cdot 6 \cdot 7 + 89 = 1053 987 + 6 + 54 + 3 + 2 \cdot 1 + 0! = 1053 Phewwww......worked hard on that one too!!
  • Otis
    Otis replied to the thread Sin/Cos periodic 2*pi.
    Hello Ryan$. It looks like you're sometimes mistyping the function's name sin as sinx. Also, I think it's best to use function...
  • H
    HallsofIvy replied to the thread calculus.
    Neglecting air resistance, the only force here is the force of gravity which, at the surface of the earth, gives a vertical acceleration...
  • MarkFL
    I would convert angles to radians, and write (using the Law of Sines)...
  • R
    Ryan$ reacted to topsquark's post in the thread Sin/Cos periodic 2*pi with Like Like.
    HallsofIvy had a good post. The way the function sin(x) is defined makes it periodic. If you go around the unit circle once (an angle...
  • R
    Ryan$ replied to the thread Sin/Cos periodic 2*pi.
    So we can have the same function with two different argument ? like sinx=sinx(x+180) and that's why called periodic? I mean periodic...
  • topsquark
    I have no idea what "superposition" means here. Are these "v"s vectors and you are referring to vector addition?
  • topsquark
    It doesn't seem to work in any case. Using a + b = 1 try out a = 2. Your expression is negative. If a \neq b then try a = 2, b = 3...
  • topsquark
    topsquark reacted to MarkFL's post in the thread Telescoping sums with Like Like.
    Okay, having proved the given identity, then we know...
  • topsquark
    topsquark reacted to Denis's post in the thread where did this term go? with Like Like.
    Become an "expert": https://www.mathsisfun.com/algebra/completing-square.html
  • topsquark
    topsquark replied to the thread Sin/Cos periodic 2*pi.
    HallsofIvy had a good post. The way the function sin(x) is defined makes it periodic. If you go around the unit circle once (an angle...
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