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# I can't believe watch

1. that you'd be ever so kind enough to help me out, thank you!

How would you go about doing part a)

https://gyazo.com/91fb197b8f3bf96c80f1f2885315a71f
2. a) how do you know that 1 < x < 9

because it says so in the question
3. (Original post by alkaline.)
a) how do you know that 1 < x < 9

because it says so in the question

Stick to chem dude
4. Use the triangle inequality, which says that in a triangle, the sum of any two sides must be greater than the length of the remaining side.
5. (Original post by Naruke)
that you'd be ever so kind enough to help me out, thank you!

How would you go about doing part a)

https://gyazo.com/91fb197b8f3bf96c80f1f2885315a71f
In a triangle, the sum of two sides must be greater than the other side.
6. Consider the maximum and minimum values of cosine in the cosine rule.
7. (Original post by constellarknight)
Use the triangle inequality, which says that in a triangle, the sum of any two sides must be greater than the length of the remaining side.
is tis' true for all triangles
8. (Original post by maggiehodgson)
In a triangle, the sum of two sides must be greater than the other side.
I said it first.

(Original post by Argylesocksrox)
Consider the maximum and minimum values of cosine in the cosine rule.
No need for anything as complicated as that for the first part.
9. (Original post by maggiehodgson)
In a triangle, the sum of two sides must be greater than the other side.
is tis' true for all tringles
10. (Original post by Naruke)
is tis' true for all triangles
Yes, it's a well-known inequality: Euclid Book 1 Proposition 20.
11. (Original post by constellarknight)
Yes, it's a well-known inequality: Euclid Book 1 Proposition 20.
Thanks. You are amazing.
12. (Original post by constellarknight)
I said it first.

No need for anything as complicated as that for the first part.
Yes you did but when I tried to answer it there had been no replies. I was not trying to steal your thunder.
13. No problem.
14. (Original post by constellarknight)
Yes, it's a well-known inequality: Euclid Book 1 Proposition 20.
Or just common sense.
15. (Original post by tiny hobbit)
Or just common sense.
Thanks. Why that was needed
16. Hmm. post graduate work seems easy????

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