Question

sec(39°) in terms of its cofunction

Answer 1

can you give me an example of what a cofunction is?

Answer 2

or the definition, whichever you prefer

Answer 3

http://www.mathwords.com/c/cofunction_identities.htm

Answer 4

@aaleena, I need to know if you understand that part of the question. Can you please respond so we can move forward?

Answer 5

if f(x) is a cofunction of g(x), then

f(x) = g(90 - x) in degree mode
f(x) = g(pi/2 - x) in radian mode

Answer 6

example: COsine is a CO-function of sine

Answer 7

which is why sin(x) = cos(90-x) and cos(x) = sin(90-x)

Answer 8

@aaleena , if you scroll down (underneath this comment) there is an empty box, then click the little blue "post" button under on the right

Answer 9

ok

Answer 10

yay! cool, so, now, do you understand the word cofunction?

Answer 11

I know the answer to this question which is csc 51 degree
But don't know how to show the work.

Answer 12

ok, I can help you with that if you bear with me :)

Answer 13

ok

Answer 14

so, do you know the cofunction for secant?

Answer 15

cosecant

Answer 16

cosecant which is csc right?

Answer 17

yeppers

Answer 18

ok

Answer 19

ok, so now, unfortunately you have to memorize the identity here but if you look at jim's post, you will see the basic idea. Let me know if you understand his explanation for degrees

Answer 20

okay but where is Jim's post?

Answer 21

scroll up a little and you will se a guy with the username @jim_thompson5910

Answer 22

never mind ... I just found Jim's post

Answer 23

ok

Answer 24

okey dokey, so now, let me know if you understand the first part with "degree mode"

Answer 25

ok

Answer 26

yeah I can understand it

Answer 27

ok, so how we get between uses that, we have sec(39) In our cofunction, we can use csc(90-x) So, our x=39, can you substitute that into the cosecant for me please?

Answer 28

csc(90-39) = 51

Answer 29

yep, so that is how you get csc(51)

Answer 30

okay. I have another question how can I solve this sin 1/2

Answer 31

ok, make a new post. Close this question. Give someone a medal, then write a new question and tag me using the @ symbol and my username

Answer 32

ok