anonymous
  • anonymous
give the exact value of f(pi/3) if f(X)=6cosx-10sin2x
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
why 7x+4?
AravindG
  • AravindG
substitute \(x\) with \(\dfrac{\pi}{3}\)
anonymous
  • anonymous
ok and then from here I am not clear what do

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anonymous
  • anonymous
Do you know what is the cosine and sine of pi/3?
anonymous
  • anonymous
cosine pi/3=.9998329795 and sine pi/3=.0182760276
AravindG
  • AravindG
:) Then whats the problem ?
anonymous
  • anonymous
Do you know what the unit circle is?
AravindG
  • AravindG
just put those values in the function get the answer be happy :)
anonymous
  • anonymous
The values are not correct. cosine of pi/3 is .5
anonymous
  • anonymous
and sine of pi/3= sqrt(3)/2
anonymous
  • anonymous
ok. I have the answer my teacher put up on the board which is 3-5\[\sqrt3\]
anonymous
  • anonymous
Remember that you are finding the values in radians, not degrees.
anonymous
  • anonymous
but I cannot seem to get this value
anonymous
  • anonymous
oh! that helps thanks :)
anonymous
  • anonymous
|dw:1359283703684:dw|
anonymous
  • anonymous
Just continue from there.
anonymous
  • anonymous
|dw:1359283831486:dw|
anonymous
  • anonymous
oh ok I got it! thank you so much!
anonymous
  • anonymous
Sure.

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