Shin's Useless Theorem

$$\frac{c\sin{A}}{\sin{C}} = \frac{\left(b-c\right)\left(\cos{B}-\cos{C}\right)}{\cos{\left(2B\right)}-\cos{\left(B-C\right)}}$$

Note by Tristan Shin
4 years, 9 months ago

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Can you please post a proof?

- 2 years, 8 months ago

hi makorn!

- 3 months, 3 weeks ago

Hmm this was 2 years ago so I don't quite recall my proof. If I rediscover it I'll share it here.

Also to note: that was when I was in 7th grade and prone to errors, so there is a high chance the property is not true :P

- 2 years, 8 months ago