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2002 Paper 1 Question 4 - HSN forum

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2002 Paper 1 Question 4


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#1 tupacshakur

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Posted 19 May 2005 - 03:10 PM

in the answers i have it says you differentiate the equation and make it equal to 1

BUT how would you know how to do that in the exam. What word/clues in that question would lead u into doing that?
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#2 aldo

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Posted 19 May 2005 - 03:23 PM

By setting the differential equal to zero on other ocassions, it is because you are looking for a stationary point (i.e where the gradient is zero).

In the question you are told that the tangent makes an angle of 45 power0.gif with the positive x-direction. That is, its gradient equals 1.

So when you obtain the differentiated expression, set it equal to one NOT ZERO!!!





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