## Claire4christ 3 years ago I need help I will download question

1. Claire4christ

@mayankdevnani

2. Claire4christ

3. Claire4christ

Do you know the trigonometric identities? Sin and cosine?

5. Claire4christ

|dw:1349573615545:dw|

7. Claire4christ

cos 50=x/90

Not so fast. So we know that $$a=50$$ degrees. $$\cos a=\frac BC$$. $$C$$ we know is $$90$$. So yes, to solve for B, you would use $$B=90\cos a$$.

9. Claire4christ

cost 50=confused

10. Claire4christ

cos 50=x/90

Yes. Multiply both sides by $$90$$.

12. Claire4christ

you multiply 50x90 right

No, you multiply 90 by cos 50.

14. Claire4christ

50x90=4,500

15. Claire4christ

i got 4,500

$90\cdot\cos50\neq90\cdot50$

17. Claire4christ

i got 86.87

That sounds off.

19. Claire4christ

im not sure

Do you know how to do $$90\times\cos50$$?

21. Claire4christ

cosx50 right

No, $$\cos$$ is an operation.

23. Claire4christ

im getting 4,500 for some reason

Alright, do you know what an operation is? $$\sin x$$ and $$\cos x$$ are like machines into which you put a number $$x$$ and retrieve a value. So do $$\cos50$$ first.

25. Claire4christ

im getting 50

26. Claire4christ

i did cos 50

27. Claire4christ

if i do 50 cos=0.9649

$$50\cos\neq\cos50$$.

It's not a multiplication.

30. Claire4christ

im getting 50

31. Claire4christ

i click on cos and than i put 50 so i got 50

I have no idea what you're talking about. You sound confused. Do you know what $$\sin x$$ is?

33. Claire4christ

yes on calculator

No, even more importantly, $$\sin x$$ is an operation performed on $$x$$. You're used to operations like $$+,-,\times,\div$$, but $$\sin x$$ is an operation like that. You can't just move the $$\sin$$ around.

@swissgirl @bahrom7893 I can't tell what the confusion here is. Help me!

@nincompoop You are a better teacher.

37. swissgirl

Ok well on your calculator you should have this button called sin, cos and tan correct?

38. Claire4christ

yes

39. swissgirl

allrrighhttyy so on your calculator type 90*Cos(50) then press enter

40. swissgirl

ohhhh u r on radians. You gotta set your calculator to degrees

41. Claire4christ

oh that's the problem

42. Claire4christ

i dont know why im getting 4,500

43. Claire4christ

what i did is 90xcos50

44. Claire4christ

you don't multiply when its cos(50) right

45. swissgirl

90*50=4500 But we are typing 90*Cos(50) remember to include the Cos

46. Claire4christ

ok i was using my iphone calculator that's why it wasnt working now im using internet cal and i got57.85

47. swissgirl

Correct:)

48. Claire4christ

so what's next

49. swissgirl

51. Claire4christ

The cosine of a 50° angle is ____

@lgbasallote YOU.

The second most powerful. Most powerful is undoubtedly CleverBot. :P

Unfortunately, CleverBot is not programmed to give you right answers. Just data mine a lot.

55. Claire4christ

ok who i should ask for help

Ugh, I don't know how to help because it seems you aren't clear about what you're confused on.

57. Claire4christ

ok

58. Claire4christ

i wasnt using the right calculator

59. Claire4christ

now i got it