## Babynini one year ago Find the exact value of sin(pi/12) using the Addition/Sub formulas

1. Babynini

@Astrophysics

2. Babynini

@jim_thompson5910

3. jim_thompson5910

hint: $\Large \sin\left(\frac{\pi}{12}\right) = \sin\left(\frac{\pi}{3} - \frac{\pi}{4}\right)$ then use the identity sin(x-y) = sin(x)*cos(y) - cos(x)*sin(y)

4. jim_thompson5910

alternatively, you can use the fact that $\Large \sin\left(\frac{\pi}{12}\right) = \sin\left(\frac{1}{2}*\frac{\pi}{6}\right)$ and use the half angle identity for sine. But it looks like they want you to use the first method

5. Babynini

ooh thanks! Yes, I got the 1/2 * pi/6 but couldn't figure that out with the addition/subtraction and had forgotten about the half angle identity. Thanks! :)

6. Babynini

(sorry for taking long to respond, I was having dinner and forgot)