## sara1234 2 years ago Find an exact value. sin (17pi/12)

1. RyanL.

you can always plug it in a calculator

2. sara1234

idk how

3. RyanL.

try using this websiite: http://www.wolframalpha.com/

4. RyanL.

Type in what you wrote and it will give you the exact value.

5. RyanL.

It will also explain some reasoning behind it.

6. RyanL.

http://www.wolframalpha.com/input/?i=sin+%2817pi%2F12%29 here i plug it in for you

7. sara1234

the input is wrong its not written correctly

8. sara1234

sin (17pi ) parenthesis around the whole thing ----- 12

9. RyanL.

Ok then plug that in.

10. sara1234

how?

11. RyanL.

Idk you just wrote it for me. lol you tell me

12. Yahoo!

sin (17pi/12) = sin255

13. mickey4691

i think they want her to evaluate that expression without a calculator, and to do that you would have to refer to the calculator

14. mickey4691

i mean refer to the UNIT CIRCLE and not the calculator

15. Yahoo!

Sin ( 180 + 75) = -Sin 75

16. freewilly922

Pretty sure that "exact value" means -not- to use a calculator but something like sin(a-b)=

17. sara1234

http://www.wolframalpha.com/input/?i=sin+%2817pi+over+12%29 it didnt give me what i was looking for the answer choices have sqr.6 and sqr.2/4 with differnt signs as answers

18. freewilly922

do you know what the sin and cosine of 1pi, 1/2 pi and 1/6 pi? also known as 180 degrees, 90 degrees and 30 degrees?

19. Yahoo!

Sin 75 = sin(45 + 30) = sin45 cos 30 + cos45 sin30

20. sara1234

no

21. Yahoo!

wat no ?

22. mickey4691
23. sara1234

where is that located confused?

24. mickey4691

17pi / 12 to degrees is (17pi)/12 * 180/pi, which is 255 degrees, can yu locate 255 degrees?

25. RyanL.

You can't just pop up a unit circle with values. You have to explain how you get those values for those certain degrees.

26. mickey4691

fine, then explain to her

27. sara1234

did you see thw attacment with the question

28. mickey4691

yea, i saw it