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# C3 Differentation: Where did I go wrong in this question...? Watch

1. I've attached my working out as well as the question

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2. (Original post by creativebuzz)
I've attached my working out as well as the question
3. (Original post by aoxa)
Fixed

4. (Original post by creativebuzz)
Fixed

At the end, you don't need to square root the x and y co-ordinates, as the distance you are finding is just the distance from the origin to another point on the y axis, so your distance will just be the y co-ordinate, pi/2 -1.

I can't see where the other mistake is, with ending up with a -pi/2 -1 instead of a +pi/2 -1.
5. (Original post by aoxa)
At the end, you don't need to square root the x and y co-ordinates, as the distance you are finding is just the distance from the origin to another point on the y axis, so your distance will just be the y co-ordinate, pi/2 -1.

I can't see where the other mistake is, with ending up with a -pi/2 -1 instead of a +pi/2 -1.
Ah I see, thank you!

Is it alright if you can see where I'm going wrong here?
I've got the form of the equation correct but I don't know how to find "the greatest value of eachfunction and the smallest positive value of x"

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6. (Original post by creativebuzz)
Ah I see, thank you!

Is it alright if you can see where I'm going wrong here?
I've got the form of the equation correct but I don't know how to find "the greatest value of eachfunction and the smallest positive value of x"

I'm sorry but we don't do that for our spec so I have no idea what you're doing! I would suggest differentiating it and put solving dy/dx=0 for the greatest value of the function because I recall doing something similar in step class but I don't know if that would help at all!
7. (Original post by aoxa)
I'm sorry but we don't do that for our spec so I have no idea what you're doing! I would suggest differentiating it and put solving dy/dx=0 for the greatest value of the function because I recall doing something similar in step class but I don't know if that would help at all!
Oh no that's okay! Positive rating given anyway

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