anonymous
  • anonymous
how can you solve cos2x=0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
What angles make cosine =0?
anonymous
  • anonymous
I actually need a trig recap because I havent taken trig in a year and now i to review it for my ap calc h.w.
anonymous
  • anonymous
do i use the unit circle?

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anonymous
  • anonymous
I can tell you but it is important you know how cosine function behaves. Google it and come back to me, I am willing to help you!
anonymous
  • anonymous
You can use the unit circle, of course!
anonymous
  • anonymous
what do you mean by angles that make up cosine?
anonymous
  • anonymous
the angle whose cosine function is zero
anonymous
  • anonymous
well, I have to go. I will give you the solution. Angles that make cosine =0 are:\[\theta=(2k+1)\frac{ \pi }{ 2 }\] where k=[0,±1,±2,±3..........and so on], then your solution is:\[2x=\theta=(2k+1)\frac{ \pi }{ 2 } \rightarrow x=(2k+1)\frac{ \pi }{ 4 }\]
zepdrix
  • zepdrix
\[\Large \cos2x=0\]Applying `Cosine Double Angle Formula`:\[\Large 2\cos^2x-1=0\]Solve for cos x! :)
zepdrix
  • zepdrix
That's how I would approach it at least :3

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