Question

Use the law of cosines to find the value of 2*2*2 cos(θ)

Answer 1

@Jhannybean

Answer 2

Well, do you know the formula for the Law of Cosines?

Answer 3

$$c^2=a^2+b^2-2ab\cos C$$In our case, \(c=1\) and \(a=b=2\). Our \(C\) here is \(\theta\).$$1^2=2^2+2^2-2(2)(2)\cos\theta\\1=8-8\cos\theta\\-8\cos\theta=-7\\8\cos\theta=7$$

Answer 4

So, I made a mistake when I got -8.. Thank you very much