Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
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You can expand the terms as Mathsisfun said.
You are just on the edge of learning this, I think. For the moment don't be "overawed" by it. In a few years you will say "ah, obviously!"
Well, just by expanding.
How did you get to the c² - 2bc (cos θ) + b² (cos θ)² ?
Sometimes, I really, really want to be older.
With the help of the formula
Can I have a go at simplifying?
Oh ok. But what formula would I use if i want to find the angle oposite to side 'b' if i'm only given the lengths of sides 'a' and 'b' and the angle between them?
Has anyone seen this formula before? Or one very similar?