Trigo proving

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  1. Vadevalor's Avatar
    1 13-07-2012  18:55
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    Trigo proving
    Lost touch with trigo since never touched for a while..here's a qn
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  2. dantheman1261's Avatar
    2 13-07-2012  18:59
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    Re: Trigo proving
    1) Look up the trigonometric addition formulae for sine

    2) Expand out the brackets - the first term on the left is sin(r \theta + \frac{\theta}{2}) , for example.

    That should be enough
  3. Vadevalor's Avatar
    3 13-07-2012  19:00
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    Uh,but thats where im stuck at,cannot prove
  4. dantheman1261's Avatar
    4 13-07-2012  19:03
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    Re: Trigo proving
    So you have sin(a + b) , but with a = r \theta \text{ , } b = \frac{\theta}{2}

    Then you can use the formula
  5. Phredd's Avatar
    5 13-07-2012  19:03
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    • Location: Surrey, United Kingdom
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    Re: Trigo proving
    (Original post by Vadevalor)
    Uh,but thats where im stuck at,cannot prove
    post your working so far
  6. Vadevalor's Avatar
    6 13-07-2012  19:08
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    LHS = sin r@ cos 0.5@ - cos r@ sin0.5@

    Expanded..,where @ means tether
  7. GreenLantern1's Avatar
    7 14-07-2012  00:08
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    Re: Trigo proving
    (Original post by Vadevalor)
    Lost touch with trigo since never touched for a while..here's a qn
    Abbreviate it to trig

    trigo is gay...
  8. Vadevalor's Avatar
    8 14-07-2012  02:27
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    • Posts: 108
    Got it case closed~thx all
    Last edited by Vadevalor; 14-07-2012 at 03:17.
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