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    Exact value

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    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
    -√2/2
    √2/2
    √3/2

    © BrainMass Inc. brainmass.com March 4, 2021, 6:06 pm ad1c9bdddf
    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

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