Question

how can you solve cos2x=0

Answer 1

What angles make cosine =0?

Answer 2

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.

Answer 3

do i use the unit circle?

Answer 4

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!

Answer 5

You can use the unit circle, of course!

Answer 6

what do you mean by angles that make up cosine?

Answer 7

the angle whose cosine function is zero

Answer 8

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:\[2x=\theta=(2k+1)\frac{ \pi }{ 2 } \rightarrow x=(2k+1)\frac{ \pi }{ 4 }\]

Answer 9

\[\Large \cos2x=0\]Applying `Cosine Double Angle Formula`:\[\Large 2\cos^2x-1=0\]Solve for cos x! :)

Answer 10

That's how I would approach it at least :3