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anonymous

  • 5 years ago

Evaluate cos220cos40 + sin220sin40

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  1. anonymous
    • 5 years ago
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    are you looking for the answer in terms of radians, degrees, or just reagular numbers?

  2. anonymous
    • 5 years ago
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    I honestly don't know. It doesn't say. Probably either degrees or regular numbers.

  3. anonymous
    • 5 years ago
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    220 - 40 = 180, that's gotta be a part of it, doncha think?

  4. anonymous
    • 5 years ago
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    thats probable

  5. anonymous
    • 5 years ago
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    ok man look in the back of ur book for questions next to this

  6. anonymous
    • 5 years ago
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    see what its asking for

  7. anonymous
    • 5 years ago
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    okay, cos(-40) = cos(40) and cos(a+b) = cos(a)cos(b) - sin(a)sin(b)...

  8. anonymous
    • 5 years ago
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    ... so (a+b) = 220 + -40

  9. anonymous
    • 5 years ago
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    ohhh. thank you so much! I missed class today and my teacher just gave me the notes so I was a little confused! Thank you!

  10. anonymous
    • 5 years ago
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    not to be petty, but my friend and I are competing for medals...

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