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# C4 differentiation question watch

1. The curve C has parametric equations x=t^2 and y=sin2t

The point A is an intersection of C with the x-axis

Find in terms of pi the x coordinate of A

Confused with this one, I thought of setting y=0 but can't see anyway to go from there, any help would be great thanks
2. Yes, set y to zero.
What is 2t when sin2t=0?
Divide by 2 to get values for t, and then sub in to your x equation.
3. You're correct, put y=0 and solve for t. Do they specify the range of t in the question?
Once you've got t, substitute into x=t^2.

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Updated: March 13, 2011
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