## BloomLocke367 one year ago http://prntscr.com/7bvgo4

1. amilapsn

I can give you 5 mins dr

2. BloomLocke367

the question is there

3. Nnesha

remember CAST rule |dw:1433168945076:dw| so given value of cos is positive so it's either in first or 4th quadrant

4. BloomLocke367

I'm confused

5. Nnesha

okay they gave you cos value you have to find an angle you r familiar with the unit circle that's same like simple x y graph x represent cosine y represent sin |dw:1433169243698:dw|

6. BloomLocke367

yes, I know the unit circle

7. Nnesha

|dw:1433169288228:dw| so it's either in first or 4th quadrant now what given angle belongs to 1st or 4th qudrant ?

8. BloomLocke367

ummm

9. Nnesha

hmm can u use unit circle ?

10. BloomLocke367

30 degrees and 45 degrees, right?

11. BloomLocke367

@Nnesha

12. Nnesha

yep right both angle are in first quadrant |dw:1433169687740:dw| left side 60=30-90 triangle and right side 45-45 90 triangle given is sqrt 2 over 2 so which one you suppose to use ?

13. Nnesha

cos is adjacent over hyp right ?

14. BloomLocke367

yes

15. Nnesha

so you have to use 45-45-90 trianlge or you can look at the unit circle |dw:1433170017138:dw| at what angle cos value is sqrt 2 over 2

16. Nnesha
17. BloomLocke367

45 degrees

18. Nnesha

yep right

19. BloomLocke367

is that the inverse value?

20. Nnesha

yep given is value of soc you have to find at what angle cosine is sqrt2 over2 inverse ! :-)

21. BloomLocke367

oh, thanks!

22. Nnesha

np :-)