- #1

Maria

## Main Question or Discussion Point

Can someone please help me with this one?

cos2x = 2 cos x sin x

I need to find 4 angles :uhh:

cos2x = 2 cos x sin x

I need to find 4 angles :uhh:

- Thread starter Maria
- Start date

- #1

Maria

Can someone please help me with this one?

cos2x = 2 cos x sin x

I need to find 4 angles :uhh:

cos2x = 2 cos x sin x

I need to find 4 angles :uhh:

- #2

Zurtex

Science Advisor

Homework Helper

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- 1

Within what range of x? And have you checked what I posted to this problem in the other thread?

- #3

Maria

within the range of 0, 360

- #4

Zurtex

Science Advisor

Homework Helper

- 1,120

- 1

[tex]\sin 2 \theta \equiv 2 \cos \theta \sin \theta[/tex]

and:

[tex]\tan \theta \equiv \frac{\sin \theta}{\cos \theta}[/tex]

- #5

Maria

I got it right... :rofl:

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