anonymous
  • anonymous
Please help! Having trouble with this Precalc/Trig problem :/ Click attached
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
factor it... treat it as a quadratic...
eyust707
  • eyust707
Lets just change the name of tanx.. lets call z.

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anonymous
  • anonymous
Factor out tan(x) first..
eyust707
  • eyust707
\[z^2 - z = 0 \] can you do that one?
anonymous
  • anonymous
\[\tan(x)(\tan(x) - 1) = 0\] \[\tan(x) = 0\] And: \[\tan(x) - 1 = 0\] Now try to find x..
anonymous
  • anonymous
1/4?
anonymous
  • anonymous
?
anonymous
  • anonymous
x = arc tan(1) x=??
anonymous
  • anonymous
pi/4
anonymous
  • anonymous
http://upload.wikimedia.org/wikipedia/commons/4/4c/Unit_circle_angles_color.svg
anonymous
  • anonymous
tan(x) = 0 Can you tell for what value of x tan(x) is 0 ??
anonymous
  • anonymous
:/ uhhh
anonymous
  • anonymous
huh...
anonymous
  • anonymous
tan(x) = 0 can't you find x from it?? \[x = \tan^{-1}(0)\]
anonymous
  • anonymous
I replied to helpingtutors, pi/4?
anonymous
  • anonymous
That is not right for this..
anonymous
  • anonymous
That is right for \(tan(x) = 1\)
anonymous
  • anonymous
Can you find the value of \(tan^{-1}(0)\) ??
anonymous
  • anonymous
0
anonymous
  • anonymous
Yes..
anonymous
  • anonymous
One value you are getting 0 and other pi/4 What could be the answer can you tell ??
anonymous
  • anonymous
By looking at the answer choices..
anonymous
  • anonymous
C.? Or can you reduce?
anonymous
  • anonymous
reduce?
anonymous
  • anonymous
Are you sure with C or not ?? Tell me this thing..
anonymous
  • anonymous
Yes
anonymous
  • anonymous
Then you are right..
anonymous
  • anonymous
tangent equals zero in two points in the unit circle
anonymous
  • anonymous
C. Thank you all for your help :) I appreciate it very much
anonymous
  • anonymous
Wait..
anonymous
  • anonymous
:/
anonymous
  • anonymous
Go with @nickhouraney
anonymous
  • anonymous
So not c.?
anonymous
  • anonymous
No.. My mistake there...
anonymous
  • anonymous
whats points in the unit circle will tangent equal zero
anonymous
  • anonymous
if you answer this ^ you will have your answer
anonymous
  • anonymous
Basically : \(tan(x) = 0\) \[\implies x = n \pi, n \in \mathbb{Z}\]
anonymous
  • anonymous
n is integer here.. Put n = 0 and 1 to find your answer..
anonymous
  • anonymous
b.?
anonymous
  • anonymous
Yep..
anonymous
  • anonymous
Ahhhh I see. Thanks guys
anonymous
  • anonymous
Welcome dear..

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