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# Weird calculus question.... watch

1. Alright so I've done quite a bit of calculus but I have never seen this notation before... What is it on about?! Second derivative of what?
2. (Original post by 2.7182818)

Alright so I've done quite a bit of calculus but I have never seen this notation before... What is it on about?! Second derivative of what?
Expand the bracket and you get the second derivative of y.
3. It's not that simple is it? Taking derivatives is a seperate function to multiplication, is the bracket indicating both?
4. Is there anything (in the working) before it? I might be able to explain it if I can see all the working.
5. Solve the following differential equations (subject to the conditions y(0)=0, dy/dx(0)=1 ... It is probably just as Mr. M said, just seems a bit too easy for my liking, seeing as the question before was
...
6. (Original post by 2.7182818)

You might like to think about the sum of two squares. Can we factorise further?
7. (Original post by Mr M)
You might like to think about the sum of two squares. Can we factorise further?
Errr do we need to? If it did mean d2y/dx2 than just use auxiliary equation and get the answer in 2 lines...
8. (Original post by 2.7182818)
Errr do we need to? If it did mean d2y/dx2 than just use auxiliary equation and get the answer in 2 lines...
You have no sense of fun.

9. (Original post by Mr M)
You have no sense of fun.

Can't... unfortunately is + not - otherwise it would certainly add a slight flicker of interest to a extremely dull question. special moment...

Here's a slightly more fun one...I've got an answer but if you wanna have a go to check it then feel free!

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