anonymous
  • anonymous
find all solutions of sin^2theta=cos^2theta
Mathematics
katieb
  • katieb
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mathstudent55
  • mathstudent55
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anonymous
  • anonymous
what do i do one i've done this
JamesJ
  • JamesJ
Well, remember that cos(2x) = cos^2 x - sin^2 x So if cos^2 x = sin^2 x then cos^2 x - sin^2 x = 0 or cos(2x) = 0 Can you take it from here?

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anonymous
  • anonymous
when I do this : cos^2x-sin^2x=0 cos(2x)=0 cosx=0 x=pi, 2pi, +2k ?
anonymous
  • anonymous
JamesJ i feel like i did this wrong
mathstudent55
  • mathstudent55
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Mertsj
  • Mertsj
You need to make a substitution. Replace sin^2 theta with 1 - cos^2 theta or replace cos^2 theta with 1-sin^2 theta.
JamesJ
  • JamesJ
If cos(2x) = 0 then 2x = pi/2 + k.pi, for any integer k. Hence x = pi/4 + k.pi/2, for any integer k.
JamesJ
  • JamesJ
You can see those solutions on this graph as well.
Mertsj
  • Mertsj
\[\sin^2\theta =1-\sin ^2\theta \] \[2\sin ^2\theta =1\] \[\sin^2\theta =\frac{1}{2}\] \[\sin \theta = \pm \frac{\sqrt{2}}{2}\] \[\theta = \frac{\pi}{4}, \frac{3\pi}{4}, \frac{5\pi}{4}, \frac{7\pi}{4} + 2\pi n\]
anonymous
  • anonymous
Thank you all it's starting to make a lot more since to me now so I just gotta know my identities?
Mertsj
  • Mertsj
Yes. That is key.

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