I just have a pretty simple question, if someone could show me how it's done that would be great!

Complete the fundamental identity:

cos(w-z)using Angle Difference which iscos(θ-φ) = cosθcosφ + sinθsinφ

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- Mar 3rd 2009, 07:36 PMalexcrossSimple fundamental identity problem
I just have a pretty simple question, if someone could show me how it's done that would be great!

Complete the fundamental identity:

**cos(w-z)**using Angle Difference which is**cos(****θ-****φ) = cosθcos****φ + sinθsin****φ** - Mar 3rd 2009, 09:49 PMwytiaz
- Mar 4th 2009, 10:06 AMalexcross
So is this as far as I can go in the problem?

- Mar 4th 2009, 08:14 PMJameson
Yes, unless you have more special info about the variables in question.