Question

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

Answer 1

why 7x+4?

Answer 2

substitute \(x\) with \(\dfrac{\pi}{3}\)

Answer 3

ok and then from here I am not clear what do

Answer 4

Do you know what is the cosine and sine of pi/3?

Answer 5

cosine pi/3=.9998329795 and sine pi/3=.0182760276

Answer 6

:) Then whats the problem ?

Answer 7

Do you know what the unit circle is?

Answer 8

just put those values in the function get the answer be happy :)

Answer 9

The values are not correct. cosine of pi/3 is .5

Answer 10

and sine of pi/3= sqrt(3)/2

Answer 11

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

Answer 12

Remember that you are finding the values in radians, not degrees.

Answer 13

but I cannot seem to get this value

Answer 14

oh! that helps thanks :)

Answer 15

Just continue from there.

Answer 16

oh ok I got it! thank you so much!

Answer 17

Sure.