express in a symmetrical form

basically i don't know what is meant by "symmetrical" since this is a triangle.

the book did not give an example of this but think it was in the book prior to this Adv. Trig

the answer to this is:

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- Nov 24th 2009, 08:22 PMbigwaveexpress in a symmetrical form??
express in a symmetrical form

basically i don't know what is meant by "symmetrical" since this is a triangle.

the book did not give an example of this but think it was in the book prior to this Adv. Trig

the answer to this is:

- Nov 24th 2009, 08:41 PMJameson
- Nov 24th 2009, 09:13 PMbigwave
ok, can see how that was added but

but from the law of cosines

how is

derived?

know it is obvious but just don't see it. - Nov 24th 2009, 09:43 PMJameson
Solve law of cosines for cos(A) then substitute.

The "bc" part will cancel but you will be left with everything over 2, thus multiply every term by 2. Simplify and you will get the final form. - Nov 24th 2009, 10:45 PMbigwave
as suggested

plug in