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Sum, Difference & Product Formulae

  1. Nov 8, 2012 #1
    My answer is almost correct, except for the negative sign. Can anyone help?

    Many thanks.

    1. The problem statement, all variables and given/known data

    Q. Without using a calculator, show that [itex]\sin10^{\circ}+\sin80^{\circ}=\sqrt{2}\cos35^o[/itex]

    2. Relevant equations

    3. The attempt at a solution

  2. jcsd
  3. Nov 8, 2012 #2


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  4. Nov 8, 2012 #3
    Thank you.
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