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lilsis76

how can i determine which of the two trigonometric values is larger in a, b, and c ? a) cos pi/12 or sin pi/12 b) cos 18 degrees or cos 54 degrees c) cos 320 degrees or sin 290 degrees

  • one year ago
  • one year ago

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  1. ChmE
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    look up the unit circle

    • one year ago
  2. ChmE
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    for cos. The higher the degree up to 90 the lower the value. from 90 to 180 the value increases. for sin it is the opposite. **UNIT CIRCLE**

    • one year ago
  3. lilsis76
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    okay. im checking it out

    • one year ago
  4. lilsis76
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    |dw:1355083613247:dw|

    • one year ago
  5. lilsis76
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    okay, well for a) it says cos pi/12 and sin pi/12, how will i know where the pi/12 is??

    • one year ago
  6. lilsis76
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    |dw:1355083788207:dw| @ChmE

    • one year ago
  7. ChmE
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    its half of pi/6

    • one year ago
  8. ChmE
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    cos is the x value and sin in the y value

    • one year ago
  9. ChmE
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    you can see the the y value increases to 90 then goes back down. x value it opposite

    • one year ago
  10. lilsis76
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    oh...okay i didnt see that. so then the cos would be larger because its sqrt3/2 ?

    • one year ago
  11. ChmE
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    |dw:1355084128293:dw|x value is greater than the y value right. more right than up. so cos pi/12 is bigger

    • one year ago
  12. ChmE
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    correct

    • one year ago
  13. ChmE
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    so what is b)

    • one year ago
  14. lilsis76
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    cool, i didnt understand this what so ever last time. let me try the next one okay. and ill give u my answer. could u tell me if its right? so cos 18, would be larger than cos 54 right?

    • one year ago
  15. ChmE
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    right

    • one year ago
  16. ChmE
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    try C :D

    • one year ago
  17. lilsis76
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    okay let me see

    • one year ago
  18. ChmE
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    Careful because it is kind of a trick question

    • one year ago
  19. lilsis76
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    it be 320?

    • one year ago
  20. lilsis76
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    WAIT!, wait y

    • one year ago
  21. lilsis76
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    haha y

    • one year ago
  22. ChmE
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    yes. because sin is negative in this quadrant. It is a big red flag

    • one year ago
  23. ChmE
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    sin will always be less in quadrant 4

    • one year ago
  24. lilsis76
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    okay, so the sin would mean its smaller so that means the cos will be smaller too

    • one year ago
  25. ChmE
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    I wouldn't say that

    • one year ago
  26. lilsis76
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    okay thank you so much haha. im trying to correct my last test givin back to me and i got alot wrong cuz i didnt understand lots of things

    • one year ago
  27. ChmE
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    I hope this helped. Just think of cos as the x value on the circle and sin as the y value on the circle. Always helped me

    • one year ago
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