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Math Help - Math Help Right Away!

  1. #1
    Junior Member
    Joined
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    Oakland
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    Question Math Help Right Away!

    cos 10 degrees x sin 5 degrees - sin 10 degrees x cos 5 degrees

    How do i prove it equals sin (-5) degrees.
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  2. #2
    Super Member
    Joined
    Jun 2008
    Posts
    792
    Use the sum angle identity:

    \sin{(A-B)}= \sin{A}\cos{B}-\sin{B}\cos{A}
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