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Math Help - Trig Expressions problem

  1. #1
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    Trig Expressions problem

    Hello, this is my first post here as I have been lurking here for quiet a while but I have just now registered. I have a quick trig question.

    How would I do this?

    cotθcosθ

    I got up to here, but then I don't know what to do:

    ( cosθ / sinθ ) ( cosθ) = ( cos^2θ / sinθ )

    Thanks.
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by Intrusion View Post
    Hello, this is my first post here as I have been lurking here for quiet a while but I have just now registered. I have a quick trig question.

    How would I do this?

    cotθcosθ

    I got up to here, but then I don't know what to do:

    ( cosθ / sinθ ) ( cosθ) = ( cos^2θ / sinθ )

    Thanks.
    There seems to be something missing from this. What are we supposed to do with \cot\left(\vartheta\right)\cos\left(\vartheta\righ  t)??
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  3. #3
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    Oops! Sorry I forgot to mention that it says to write each expression in terms of sine or cosine only.
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  4. #4
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by Intrusion View Post
    Oops! Sorry I forgot to mention that it says to write each expression in terms of sine or cosine only.
    In that case then...

    You're work is good. To get it in terms of sine, just apply the identity \cos^2\left(\vartheta\right)=1-\sin^2\left(\vartheta\right).
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  5. #5
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    How do I do that? :/
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  6. #6
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    Identity: \color{red} \cos^2 \theta = 1 - \sin^2 \theta

    What you have: \frac{\color{red}\cos^2 \theta}{\sin \theta}

    How do I do that? :/
    I dunno.
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  7. #7
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    Oh, LOL! Thanks. xD
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