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Core Maths 4: Differentiation...another not getting the same answer as the book

Hi there

Please could you tell me who is correct, many thanks;


Reply 1
Avatar for ztibor
ztibor
10
The book is correct

Look after you equation where you multiplied by -1/3
−13⋅(−32)=12-\frac{1}{3}\cdot (-\frac{3}{\sqrt{2}})=\frac{1}{ \sqrt{2}}
Moreover
12+12=2\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{2}}=\sqrt{2}
(edited 11 years ago)
Book's right for the tangent, as ztibor says.

And you're right for the normal.
Reply 3
Avatar for jackie11
jackie11
OP
4
and thank you I understand that now, what about the second question?
Did you see my previous post?
Reply 5
Avatar for jackie11
jackie11
OP
4
ok thank you :smile:

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