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# C4 practice paper watch

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
2. 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 . Get the cot^2 and cosec^2 parts in terms of x and y.
3. 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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