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Thread: Help with trig proof and limit question??

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    New Member happychappystudent45's Avatar
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    Help with trig proof and limit question??

    Hey there,

    I'm having some troubles with this question here. I think I know what to do to prove the two equations but I'm not really sure if I'm doing the limit part right . Could someone give me a hand? Thanks in advance! (Question attached).
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    617 pages fan96's Avatar
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    Re: Help with trig proof and limit question??

    Note that before we do anything else, must be nonzero.

    Also, to apply the identity we require

    One method is



    and using the standard result



    leads to the answer.

    (This method doesn't work for but this case is trivial to verify separately.)
    Last edited by fan96; 6 May 2019 at 10:47 PM.
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