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anonymous

  • one year ago

Which of the following choices is a simplification of sin 60°cos15°-sin15°-cos60°?

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    can someone please help me with this

  3. DanJS
    • one year ago
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    use the values here... http://www.embeddedmath.com/downloads/files/unitcircle/unitcircle-letter.pdf

  4. DanJS
    • one year ago
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    the x - coordinates are the cosine of the angle, the y- coordinates are the sine of the angle

  5. DanJS
    • one year ago
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    Each point on the circle radius 1 is ( cos(theta) , sin(theta) )

  6. anonymous
    • one year ago
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    so in this case, i feel like c (the third answer) is the right one? Is it correct?

  7. DanJS
    • one year ago
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    didnt calculate.. umm

  8. jim_thompson5910
    • one year ago
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    hint: sin(A - B) = sin(A)cos(B) - cos(A)sin(B)

  9. anonymous
    • one year ago
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    yea i'm having trouble to convert, it seems like the 3rd answer to me

  10. DanJS
    • one year ago
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    ah i just about to say the sum formula

  11. DanJS
    • one year ago
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    Is that a minus though after sin(15)

  12. jim_thompson5910
    • one year ago
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    I think the original problem should be sin 60°cos15°-sin15°cos60°

  13. DanJS
    • one year ago
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    yea

  14. anonymous
    • one year ago
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    could it be #A?

  15. DanJS
    • one year ago
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    Apply that sum formula first, here is a cheat sheet to remember properties and identities

  16. anonymous
    • one year ago
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    JIm was correct, the original question is like what he said, it was a typo

  17. DanJS
    • one year ago
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    yea, so apply this rule... sin(A - B) = sin(A)cos(B) - cos(A)sin(B)

  18. DanJS
    • one year ago
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    since the question is exactly th eform of that right side

  19. DanJS
    • one year ago
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    sin(60 - 15) = sin(45)

  20. DanJS
    • one year ago
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    root 2 over 2

  21. anonymous
    • one year ago
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    I will go through your sugguested process again to confirm, thank you so much!

  22. DanJS
    • one year ago
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    yeah, just have to recognize that form to simplify it with the identity thing, Either way, you could have just subbed all 4 values in and it would come out the same

  23. anonymous
    • one year ago
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    sorry idk i wish i could help doe

  24. anonymous
    • one year ago
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    love u

  25. anonymous
    • one year ago
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    wrong person

  26. anonymous
    • one year ago
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    new phone who dis

  27. anonymous
    • one year ago
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    u should go on pathway

  28. anonymous
    • one year ago
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    it rally helps

  29. anonymous
    • one year ago
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    |dw:1438910967015:dw|

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