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    Question paper: http://www.google.co.uk/url?sa=t&sou...jjvdsKNr4xSXyQ


    can anyone please explain q 6c)? I really can't see how to eliminate t?

    (markscheme) http://www.balcarras.gloucs.sch.uk/c...k%20scheme.pdf
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    The question is asking about two trig functions, cot and sin. So you'll want to find a formula that relates them in some way or another.

    You may be aware of the formula 1+\cot^2 t = cosec^2 t. Get the cot^2 and cosec^2 parts in terms of x and y.
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    From sin^2+cos^2=1, you can derive 1+cot^2= cosec^2.
    1/sin^2 = cosec^2
    Just re-arrange the x and y parametric equations into the forms you require.
 
 
 
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Updated: April 12, 2011

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