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Thread: Definition of a Natural Number - Needed to solve a Trignometric Equation

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    Frenzied Member KayJay's Avatar
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    Post Definition of a Natural Number - Needed to solve a Trignometric Equation

    I've been working on this off and on for a very very long time now. I'm stuck Can the below be solved at all
    Code:
    Sqr(A*Tan(t))  = N ; Where N is natural number
    for a given natural constant "A", with "t" ranging from 45 degrees to 90 degrees
    Is it solvable?

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  2. #2
    So Unbanned DiGiTaIErRoR's Avatar
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    Hmmm

    well

    a=-n^2/tan(t) and n =< 0

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    Frenzied Member KayJay's Avatar
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    Thanxs. Will that result in "N" being "Natural"? My question again; What is a Natural Number?

    Anyways its going to take a while to digest that.

    Now. my question was wrong Sorry. It should read
    Code:
    Sqr(A*Tan(t))  = N ; Where N is natural number
    for a given natural constant "A", with "t" ranging from 0 degrees to 45 degrees
    You would have realised by now this is to with Prime Numbers

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    Fanatic Member bugzpodder's Avatar
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    tan0=0
    tan45=1

    A*tan(t) - goes from 0 - A
    sqrt(A*tan(t)) - goes from 0 - sqrt(A)

    so your answer would be all natural numbers between 0 - sqrt(A)
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    Frenzied Member KayJay's Avatar
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    Thanx for the reply. I do understand UR solution. But in that range, lies all solutions for the equation, not only Postive Integers. So how does one define a Positive Integer, such that its curve may be intersected with the above equation, to find points of intersection.

    Am I out of my mind? or do I make any sense at all

    Thanx

    "Brothers, you asked for it."
    ...Francisco Domingo Carlos Andres Sebastian D'Anconia

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    Here is the definition - and it's only integers, not all of the reals.
    It's denoted usually as N

    http://mathworld.wolfram.com/NaturalNumber.html

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    Frenzied Member KayJay's Avatar
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    Thanx. Not much help, but a darned good site. Bookmark worthy

    Thanx again

    "Brothers, you asked for it."
    ...Francisco Domingo Carlos Andres Sebastian D'Anconia

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    Sqr(A*Tan(t)) = N

    KayJay posted:

    Sqr(A*Tan(t)) = N ; Where N is natural number for a given natural constant "A", with "t" ranging from 45 degrees to 90 degrees

    First, note that the tangent of 45 degrees =1, and the tangent of 90 degrees = infinite, So, for “t”
    Ranging from 45 degrees to 90 degrees, we can re-write the equation as:

    Sqr(A*B) = N, where B is any real number from 1 to infinity.

    The next thing to know is, does “Sqr” stand for “the square of” or for “the square root of”?

    1) For “the square root of”, we have:
    (A*B)^1/2 = N
    A*B = N^2
    B = N^2/A
    There are an infinite solutions to this equation, it seems obvious to me. For example:

    For N = 1, then B = N^2/A = 1/A
    If A = 1, then B = 1/1 = 1
    If A = 2, then B = 1/2
    Etc.

    For N = 2, then B = N^2/A = 4/A
    If A = 1, = 4/1
    If A = 2, then B = 4/2 = 2
    Etc.

    2) 2) For “the square of”, we have:
    (A*B)^2 = N^2
    A*B = N, or A*B = -N
    B = N/A, or B = -N/A
    This also has infinite solutions, and I think that obtaining a vlue of B for each combination of N and A is obvious, so, I will stop at this point.

    Oh, yes! If you MUST have the angle, than you would proceed to obtain the angle by stating that
    arctangent (t) = B, and proceeding to solve for t, in radians or in degrees, as desired.

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