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

Mathematics
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why 7x+4?
substitute \(x\) with \(\dfrac{\pi}{3}\)
ok and then from here I am not clear what do

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Other answers:

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

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