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mdelgado167

give the exact value of f(pi/3) if f(X)=6cosx-10sin2x

  • one year ago
  • one year ago

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  1. mdelgado167
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    why 7x+4?

    • one year ago
  2. AravindG
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    substitute \(x\) with \(\dfrac{\pi}{3}\)

    • one year ago
  3. mdelgado167
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    ok and then from here I am not clear what do

    • one year ago
  4. zordoloom
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    Do you know what is the cosine and sine of pi/3?

    • one year ago
  5. mdelgado167
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    cosine pi/3=.9998329795 and sine pi/3=.0182760276

    • one year ago
  6. AravindG
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    :) Then whats the problem ?

    • one year ago
  7. zordoloom
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    Do you know what the unit circle is?

    • one year ago
  8. AravindG
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    just put those values in the function get the answer be happy :)

    • one year ago
  9. zordoloom
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    The values are not correct. cosine of pi/3 is .5

    • one year ago
  10. zordoloom
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    and sine of pi/3= sqrt(3)/2

    • one year ago
  11. mdelgado167
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    ok. I have the answer my teacher put up on the board which is 3-5\[\sqrt3\]

    • one year ago
  12. zordoloom
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    Remember that you are finding the values in radians, not degrees.

    • one year ago
  13. mdelgado167
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    but I cannot seem to get this value

    • one year ago
  14. mdelgado167
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    oh! that helps thanks :)

    • one year ago
  15. zordoloom
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    |dw:1359283703684:dw|

    • one year ago
  16. zordoloom
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    Just continue from there.

    • one year ago
  17. zordoloom
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    |dw:1359283831486:dw|

    • one year ago
  18. mdelgado167
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    oh ok I got it! thank you so much!

    • one year ago
  19. zordoloom
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    Sure.

    • one year ago
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