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# Trouble With Parametric Differentiation watch

1. Having trouble showing the working out for the answer to this question.

Q - Find dy/dx for the curve defined as :
x = cos^2 t
y = 1-sin t

2. (Original post by TehJokur)
Having trouble showing the working out for the answer to this question.

Q - Find dy/dx for the curve defined as :
x = cos^2 t
y = 1-sin t

What have you tried? Or do you not know where to start?
3. (Original post by Notnek)
What have you tried? Or do you not know where to start?
I tried it and managed to get -cost x 1/-sint
4. (Original post by TehJokur)
I tried it and managed to get -cost x 1/-sint
Can you please post working to show how you got that?
5. Just use the fact that dy/dx =dy/dt x dt/dx
6. you should try and find

dy/dt / dx/dt
7. (Original post by TehJokur)
I tried it and managed to get -cost x 1/-sint
well you did something wrong then, didn't you? Show us what you did and we can tell you where you went wrong.
8. (Original post by Notnek)
Can you please post working to show how you got that?
Just got it!

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