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Math Help - Help proving trig identities.

  1. #1
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    Help proving trig identities.

    (tan x)(1-cot x)
    Here's what I tried:
    Sin/cos(1-cos/sin)
    --That obviously didn't work


    cos x/1-sin x=sec x + tan x
    I don't really know how to begin on this one.


    Any hints and help is appreciated. Thanks in advance.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by beetz View Post
    (tan x)(1-cot x)
    Here's what I tried:
    Sin/cos(1-cos/sin)
    --That obviously didn't work
    of course it didn't work, there's no identity here! what should you be proving?

    cos x/1-sin x=sec x + tan x
    Consider the LHS.

    multiply through by \frac {1 + \sin x}{1 + \sin x} and simplify

    and use parentheses next time to clarify what you mean. you should have typed (cos x)/(1 - sin x). here it was easy to see what you meant, but it won't always be
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