Question

Please help! tan67degrees 30' AND sin67degrees 30'= ?
CLICK ATTACHMENTS PLEASE

Answer 1

first recall the unit circle, rember what quad tan is in and if it is negative or postive in the quad find where 75. look at the answer but I am thinking -1-square root of 2 give me a second I will make sure I am right

Answer 2

Ok thanks

Answer 3

is this in degrees or rad?

Answer 4

degrees I believe

Answer 5

make sure plz the answer would change if not in degrees.

Answer 6

degrees for sure

Answer 7

okay

Answer 8

hang on doing some checking

Answer 9

Thanks

Answer 10

use the half angles to solve this

Answer 11

check something for me, does it want the exact answer or broken down because I have an answer for you,it just doesn't match the ones on the attchment

Answer 12

The options in the attachments are the only options :/ I think one will be equivalent to your answer though

Answer 13

do you have the half angles formual?

Answer 14

No :/

Answer 15

Half-Angle Formulas:
sin x/2=±√[(1-cos x)/2)]
cos x/2=±√[(1+cos x)/2)]
tan x/2=(sin x)/(1+cos x)
..
sin 75º=sin 150/2=±√[(1-cos 150)/2)] (use positive root because 75º is in quadrant I where sin>0)
=√[(1-(-√3/2))/2)]
=√[(1+√3/2)/2)]
=√.933≈.966
..
cos 75º=cos 150/2=±√[(1+cos 150)/2)] (use positive root because 75º is in quadrant I where cos>0)
=√[(1+(-√3/2))/2)]
=√[(1-√3/2)/2)]
=√.067≈.259
..
tan 75º=tan 150/2=sin 150/(1+cos 150)
=(1/2)/(1+(-√3/2))
≈3.73

Answer 16

does that help??

Answer 17

Yes! So those explain sin and tan? From my problems?

Answer 18

yes as close as possible.

Answer 19

I will try to find exact might take a few min for me

Answer 20

Oh thanks very much, and don't feel like you're in a rush. I'm patient. I just want to make sure I fully understand :)

Answer 21

no prob and don't want to lead you the wrong way either.

Answer 22

Yea, I'm not getting them :/ The options from the attachments aren't matching up to the help and explanation you provided me with

Answer 23

Dang! That's kinda hard to read haha

Answer 24

how do you attch a file??

Answer 25

Hmm... well. You can copy/paste that to a Powerpoint slide, then right click on the image that pasted and select save image. Then you save it, come back here, click attach file, and find the saved image

Answer 26

go to this website http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/simpleTrig.html

Answer 27

this website has the half angles worked out for you

Answer 28

did it work for you?

Answer 29

Yes, I was able to connect to the website

Answer 30

you see the chart that has the half angles on it?

Answer 31

Is it the chart above proofs?

Answer 32

yes

Answer 33

K, got it. Now I match them up?

Answer 34

match them up with the angles and exact answers given on the chart. Also,you might want to save that chart in case a problem like this happens again.

Answer 35

O.k, for sin would the answer be a.? :/ From my attachment? How would I get tan though

Answer 36

ON TAN THE FIRST ONE AND SIN THE LAST ONE ON THE ANSWERS

Answer 37

Oh, I get it now

Answer 38

look at the chart and you will find those answers on it.

Answer 39

Yup, see them. Thank you so much!

Answer 40

no prob sorry I could not be quicker for you.

Answer 41

No, it's totally fine! I really appreciate the time and effort you put in to help me. There should be more people like you on this site :) THANKS