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Math Help - Differentiation- Product Rule

  1. #1
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    Differentiation- Product Rule

    Find the gradients of the curve y=x\sqrt{4-x^2} at the points where it crosses the straight line y=x
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  2. #2
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    I am becoming concerned about people posting problems without showing even an attempt at the problem. Write y= x\sqrt{4- x^2}= x(4- x^2)^{1/2} and use the product rule, that you refer to and the chain rule on (4- x^2)^{1/2}. Since the problem asks for the derivate where the curve crosses y= x, you will need to solve y= x= x\sqrt{4- x^2} to determine the x values.
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  3. #3
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    Sorry about that, I have already attempted the question five times and have finally found the problem. Thanks. The problem was I didn't + - for square root of 3
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