I'm going nuts! If I can prove the Sine and Cosine Law and pass it on Monday by 1:40pm GMT+08 in my Math class, then I can gain 2 bonus points for my Math 4 periodical exam (believe me, 2 points are a luxury in my school). However, I'm having a mental block... so... ideas go boing! from my head.
Here's the Cosine Law (capitals for lengths, and lowercase for the angle):
A2 = B2 + C2 - 2BCcosa.
A-squared is equal to B-squared plus C-squared minus 2 (B) (C) cosine angle-alpha.
Thanks!
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