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    SarahIsSuper's Avatar
    SarahIsSuper Posts: 1, Reputation: 1
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    #1

    Mar 12, 2013, 12:57 PM
    Verify Identity?
    cos(x-(π)/(4))=((√(2))/(2))(cosx+sinx)

    Thank you so much!
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 12, 2013, 01:09 PM
    Hint: apply the identity for , where and .
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