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    cpp2011's Avatar
    cpp2011 Posts: 5, Reputation: 1
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    #1

    Jul 17, 2008, 01:49 AM
    Trig is a mess.
    Can anyyone please help me understand proving trig identities, or at least if you could help in any type of trig stuff... :confused:
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jul 17, 2008, 03:31 AM
    Yes, most likely, if you would post a problem.
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    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Jul 17, 2008, 03:36 AM
    You need to know your formulae and apply them to solve your proof problem. The thing is to 'see' how to solve it. Don't worry, it'll come with practice.
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    cpp2011 Posts: 5, Reputation: 1
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    #4

    Jul 17, 2008, 04:00 AM
    Quote Originally Posted by galactus
    Yes, most likely, if you would post a problem.
    (sinx+1)/cosX+cotX=tanx
    trig identity proof
    and
    let tan(theta)=5/12 with (theta) in Q I
    find sin2(theta)
    are the two problems that I can't get
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    galactus Posts: 2,271, Reputation: 282
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    #5

    Jul 17, 2008, 05:43 AM
    Is that

    I believe it is.

    Change the cot(x) on the left in the denominator to

    Then, simplify and factor a little. You will see another 1+sin(x) terms and they will cancel.

    The tan will reveal itself as
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