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

    Feb 4, 2012, 03:54 AM
    Proving trigonometric identities solver?
    Please prove if these two are identity ty.

    Aurora2000's Avatar
    Aurora2000 Posts: 111, Reputation: 16
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    #2

    Feb 4, 2012, 07:53 AM



    Now , thus

    Now you have to prove
    .
    Multiplying both sides by this becomes

    and using you conclude.


    Jmiller23's Avatar
    Jmiller23 Posts: 1, Reputation: 1
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    #3

    Mar 12, 2012, 06:49 PM
    sec^4x-sec^2x=tan^4x+tan^2x
    trigster's Avatar
    trigster Posts: 1, Reputation: 1
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    #4

    Apr 21, 2012, 06:28 AM
    sin2x=2tanx/(1+tan^2x)
    wendyjewel's Avatar
    wendyjewel Posts: 1, Reputation: 1
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    #5

    Jun 9, 2012, 01:14 PM
    4sin^2x+2cos^2x
    jamesjonesmiami's Avatar
    jamesjonesmiami Posts: 1, Reputation: 1
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    #6

    Oct 16, 2012, 05:35 PM
    I need to find the proof cot^2-1/csc^2=1-2sin^2
    ebaines's Avatar
    ebaines Posts: 12,132, Reputation: 1307
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    #7

    Oct 17, 2012, 06:05 AM
    Quote Originally Posted by jamesjonesmiami View Post
    i need to find the proof cot^2-1/csc^2=1-2sin^2
    You have mistated the identy: it should be (cot^2-1)/csc^2 = 1-2sin^2

    As always, it's best to replace the cot and csc functions with their sin and cos equivalents. Then it comes right out if you apply one of the standard iidentities that you should know be heart: cos^2 + sin^2 = 1

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