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

    Jan 28, 2011, 07:07 AM
    verify identities solver?
    tan2x=(2tanx)/(1-tan^2x)
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jan 28, 2011, 07:28 AM

    Use the compound angle formula for the tan function.

    I hope you know it, right?
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #3

    Jan 28, 2011, 07:32 AM



    When proving trig identities, try getting into the habit of converting everything to sin and cos.



    The right side becomes:





    Now, knowing that

    and

    we get:



    chylathomas's Avatar
    chylathomas Posts: 1, Reputation: 1
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    #4

    Dec 2, 2011, 08:02 AM
    Cos^2x+sin^2x/2sinxcosx
    ampomaah's Avatar
    ampomaah Posts: 1, Reputation: 1
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    #5

    Feb 28, 2012, 10:57 PM
    (sin(X))/(tan(X))+(cos(X))/(cot(X))=sin(X)+cos(X)
    mollieblake's Avatar
    mollieblake Posts: 2, Reputation: 1
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    #6

    Apr 11, 2012, 09:00 PM
    cos^2x=(1/2)cos2x
    ebaines's Avatar
    ebaines Posts: 12,132, Reputation: 1307
    Expert
     
    #7

    Apr 12, 2012, 10:47 AM
    Quote Originally Posted by mollieblake View Post
    cos^2x=(1/2)cos2x
    Answered here:
    https://www.askmehelpdesk.com/mathem...2x-650298.html
    ebaines's Avatar
    ebaines Posts: 12,132, Reputation: 1307
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    #8

    Apr 12, 2012, 10:49 AM
    Quote Originally Posted by ampomaah View Post
    (sin(X))/(tan(X))+(cos(X))/(cot(X))=sin(X)+cos(X)
    Simply convert the tan(x) and cot(x) functions to their sine and cosine equivalents, and it comes right out.
    mackenzielech's Avatar
    mackenzielech Posts: 1, Reputation: 1
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    #9

    Feb 20, 2013, 07:03 PM
    cot 2x= cot^2x-1/2cotx
    ebaines's Avatar
    ebaines Posts: 12,132, Reputation: 1307
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    #10

    Feb 21, 2013, 05:51 AM
    Quote Originally Posted by mackenzielech View Post
    cot 2x= cot^2x-1/2cotx
    No, the identity is incorrect:

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