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    herz's Avatar
    herz Posts: 10, Reputation: 1
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    #1

    Mar 20, 2008, 08:31 AM
    verifiying trig id's
    HELP!

    I am stuck as to where to begin on this... any guidance? I am not seeing where to start.

    1+sin2x / cosx + sinX = cos2x / cosx - sinx

    Thanks in advance!
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Mar 20, 2008, 09:09 AM
    Without proper grouping symbols it's difficult to tell what you mean.

    Is this it?:

    herz's Avatar
    herz Posts: 10, Reputation: 1
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    #3

    Mar 20, 2008, 09:14 AM
    Yes that is the priblem
    herz's Avatar
    herz Posts: 10, Reputation: 1
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    #4

    Mar 20, 2008, 10:21 AM
    Quote Originally Posted by galactus
    Without proper grouping symbols it's difficult to tell what you mean.

    Is this it?:

    correct, this is the problem
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #5

    Mar 20, 2008, 01:00 PM
    We must verify the identity. Look at the right side.

    We can take note that



    Notice this is the difference of two square, which can be written as



    Then we have

    So,



    Remember that and

    So, we have

    And it is shown.

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