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# Mathematics watch

1. Can someone please explain why sin(180-theta)= sin(theta).
2. if you look at the sine curve you will find a vertical mirror line halfway between 0° and 180°
3. (Original post by HiggsBoson)
Can someone please explain why sin(180-theta)= sin(theta).
The two points are in phase.
4. (Original post by HiggsBoson)
Can someone please explain why sin(180-theta)= sin(theta).
You can draw a unit circle
5. (Original post by HiggsBoson)
Can someone please explain why sin(180-theta)= sin(theta).
cos
6. Thank you that's really helpful.
7. (Original post by HiggsBoson)
Can someone please explain why sin(180-theta)= sin(theta).
If you draw both the graph of sin(180-x) and sin(x), you will see that the graph is shifted to the same position (since sine repeats every 180 degrees)

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