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Math Help - past paper question (encounter problems)

  1. #1
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    past paper question (encounter problems)

    Given that delta (Δ) is an acute angle such that cos delta(Δ)= 1/4x
    find the expression for sin 2delta(Δ) in terms of x


    how to do such a question??????
    Last edited by mathkid12; March 18th 2012 at 01:30 PM.
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  2. #2
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    Re: past paper question (encounter problems)

    Quote Originally Posted by mathkid12 View Post
    Given that delta (Δ) is an acute angle such that cos delta(Δ)= 1/4x
    find the expression for sin 2delta(Δ) in terms of x


    how to do such a question??????
    \cos(\Delta) = \frac{1}{4x} or \frac{1}{4} x ???
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  3. #3
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    Re: past paper question (encounter problems)

    second one, 1/4 x (sorry i cant type the equations properly i dont know how??)
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    Re: past paper question (encounter problems)

    Quote Originally Posted by mathkid12 View Post
    second one, 1/4 x (sorry i cant type the equations properly i dont know how??)
    Then \sin(\Delta)=\sqrt{1-\frac{x^2}{16}}

    Learn some basic LaTeX.
    [TEX]\cos(\Delta)=\frac{x}{4}[/TEX] gives \cos(\Delta)=\frac{x}{4}.
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  5. #5
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    Re: past paper question (encounter problems)

    thanks alot
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