×

# 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
3 years, 7 months ago

Sort by:

Can you please post a proof? · 1 year, 5 months 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 · 1 year, 5 months ago