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mdelgado167

  • 3 years ago

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

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  1. mdelgado167
    • 3 years ago
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    why 7x+4?

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

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

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

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

  6. AravindG
    • 3 years ago
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    :) Then whats the problem ?

  7. zordoloom
    • 3 years ago
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    Do you know what the unit circle is?

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

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

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

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

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

  13. mdelgado167
    • 3 years ago
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    but I cannot seem to get this value

  14. mdelgado167
    • 3 years ago
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    oh! that helps thanks :)

  15. zordoloom
    • 3 years ago
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    |dw:1359283703684:dw|

  16. zordoloom
    • 3 years ago
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    Just continue from there.

  17. zordoloom
    • 3 years ago
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    |dw:1359283831486:dw|

  18. mdelgado167
    • 3 years ago
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    oh ok I got it! thank you so much!

  19. zordoloom
    • 3 years ago
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    Sure.

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