## A community for students. Sign up today

Here's the question you clicked on:

## anonymous 3 years ago Find the derivative of f when f(x) = 2 tan(x) + 3 cot(x)

• This Question is Closed
1. cwrw238

derivative of tan x is sec^x can't remember derivative of cot x - try googling it first term of derivative is 2 sec^2 x

2. anonymous

of cotx? its -csc^2

3. cwrw238

http://www.math.com/tables/derivatives/tableof.htm this link lists derivatives

4. anonymous

please help

5. anonymous

sol: let y=f(x) y=2tan(x)+3cot(x) =2dy/dxtanx+3dy/dxcotx =2*sec^2x+3*-cosec^2x =2sec^2x-3cosec^2x

6. cwrw238

oh ok so f'(x) = 2 sec^2 x - 3 csc^2 x

7. anonymous

think they want me to make in ration form its number 3 on the hw i have attached

8. anonymous

is it answer??

9. anonymous

thats not one of the answer choices

10. anonymous

muhammand please help

11. anonymous

estudier please help

12. anonymous

are these questions???

13. anonymous

yes the document i have attached is the homework i am looking at number 3 specifically

14. cwrw238

ah what they have done is convert the sec and csc to sin and cos

15. anonymous

okay...

16. anonymous

so what is the answer

17. cwrw238

2 sec^2 x - 3 csc^2 x = 2 * 1/cos^2 x - 3 * 1 / sin^2 x

18. cwrw238

|dw:1350060084696:dw|

19. anonymous

that is not the answer

20. anonymous

please help

21. anonymous

i have to turn it on in ten minutes

22. cwrw238

well i think it is the answer but its in different form to your choices - i'm trying to figure it out

23. anonymous

2sec^2(x)-3csc^2(x)?

24. cwrw238

yes - do you agree with that answer?

25. anonymous

the answer choices r on the document

26. anonymous

swissgirl please help

27. anonymous

have attached the hw

28. anonymous

the answer choice are on the paper

29. cwrw238

i know that sandy - but i can't figure out which is equivalent to the sec and csc expression

30. anonymous

hmm maybe you need to get a common deonmanator

31. anonymous

:(

32. anonymous

do anyone know the answer

33. anonymous

raden please help

34. anonymous

due in four minutes

35. anonymous

please type faster

36. anonymous

i dont need an explainatio just the answer

37. anonymous

nvm the hw is past due now :(

38. cwrw238

there might be a mistake in the paper i'm sure 2sec^2x - 3 csc^2 x is correct but u need to convert it

39. anonymous

smh wow

40. cwrw238

hold on - i think I've got it

41. anonymous

its too late

42. anonymous

thank u anyways

43. anonymous

ohhh I got the answer $$\large {2-5\cos^2(x) \over \sin^2(x)\cos^2(x)}$$

44. cwrw238

yes - i've converted the to sines and cosines but i can't get any of the choices on the paper yes - i got that - but its not one of the choices

45. anonymous

its the fourth choice

46. cwrw238

oh - i've been looking in the wrong place!!!!!

47. anonymous

hahah I know its quite confusing to follow

48. cwrw238

lol

#### Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy