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## anonymous 4 years ago Please help! Having trouble with this Precalc/Trig problem :/ Click attached

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1. anonymous

2. anonymous

factor it... treat it as a quadratic...

3. eyust707

Lets just change the name of tanx.. lets call z.

4. anonymous

Factor out tan(x) first..

5. eyust707

$z^2 - z = 0$ can you do that one?

6. anonymous

$\tan(x)(\tan(x) - 1) = 0$ $\tan(x) = 0$ And: $\tan(x) - 1 = 0$ Now try to find x..

7. anonymous

1/4?

8. anonymous

?

9. anonymous

x = arc tan(1) x=??

10. anonymous

pi/4

11. anonymous
12. anonymous

tan(x) = 0 Can you tell for what value of x tan(x) is 0 ??

13. anonymous

:/ uhhh

14. anonymous

huh...

15. anonymous

tan(x) = 0 can't you find x from it?? $x = \tan^{-1}(0)$

16. anonymous

I replied to helpingtutors, pi/4?

17. anonymous

That is not right for this..

18. anonymous

That is right for $$tan(x) = 1$$

19. anonymous

Can you find the value of $$tan^{-1}(0)$$ ??

20. anonymous

0

21. anonymous

Yes..

22. anonymous

One value you are getting 0 and other pi/4 What could be the answer can you tell ??

23. anonymous

By looking at the answer choices..

24. anonymous

C.? Or can you reduce?

25. anonymous

reduce?

26. anonymous

Are you sure with C or not ?? Tell me this thing..

27. anonymous

Yes

28. anonymous

Then you are right..

29. anonymous

tangent equals zero in two points in the unit circle

30. anonymous

C. Thank you all for your help :) I appreciate it very much

31. anonymous

Wait..

32. anonymous

:/

33. anonymous

Go with @nickhouraney

34. anonymous

So not c.?

35. anonymous

No.. My mistake there...

36. anonymous

whats points in the unit circle will tangent equal zero

37. anonymous

if you answer this ^ you will have your answer

38. anonymous

Basically : $$tan(x) = 0$$ $\implies x = n \pi, n \in \mathbb{Z}$

39. anonymous

n is integer here.. Put n = 0 and 1 to find your answer..

40. anonymous

b.?

41. anonymous

Yep..

42. anonymous

Ahhhh I see. Thanks guys

43. anonymous

Welcome dear..

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