Help with implicit differentiation question

[Lisa Kilmartin]

Hi there,

I wondered if anyone can help with this question on motion of a particle on a curve, I keep on getting a negative answer when we are told y is increasing. Any help really appreciated.

Thanks,

Lisa

[Lucy de Faoite]

Hi,

Just did it quickly on train so chance there's a mistake but I got 0.64. Photo attached.

Lucy

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[Lisa Kilmartin]

Thank you!

 Is the first line dy/dx? Is that product rule?

I used rules of logs then derivative. I got similar answer but - negative. Your answer is correct thanks so much, I’m just struggling to see dy/dx. 

Lisa 

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[Cian Finn]

Hi Lucy,

Can you post the original question. I can't seem to see it in your post. Implicit differentiation is no longer on the LCHL course as far as I know. 

Cian

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[Lucy de Faoite]

It's in Lisa's original email. It's related rates of change, not implicit differentiation. 

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