The law of costumes is a^2 + b^2abcosC=^2. Find the value of 2abcosC.

Question

darkknight · Answer

law of costumes?

darkknight · Answer

I think you meant cosines, I'll get to you.

vWells55 · Answer

Yes I meant cosines lol

darkknight · Answer

The law of costumes is c^2=a2+b2﹣2abcos(C)
Find the value of 2abcosC.
To do this a we need to solve for 2abcos(C)
Basically we add 2abcos(C) to both sides, 
Do you have an idea of what to do from there?

vWells55 · Answer

I already answered it but thanks, honestly I didn't think anyone was gonna respond

darkknight · Answer

Like we need to find what 2abcos(C) is, if we add -2abcos(C) to both sides it will be positive (2abcos(C)) on the left side (which is what we are trying to solve for) and get canceled on the right side.

darkknight · Answer

Oh, its all good. Have a good day, also be sure to click best response but you don't have to. :)

vWells55 · Answer

Thank you for trying to help me. You have a good day as well