# Exact value

Not what you're looking for? Search our solutions OR ask your own Custom question.

Find the exact value by using a sum or difference identity. Which is the correct answer?

cos 20 cos 25 - sin 20 sin 25 (angles are in degrees)

1

-âˆš2/2

âˆš2/2

âˆš3/2

https://brainmass.com/math/basic-calculus/exact-value-difference-identities-29182

#### Solution Summary

This shows how to find the exact value by using a sum or difference identity.

$2.49