# Differentiation Help

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Thread starter 1 month ago
#1
Where do I even start? And someone show me the steps to do this please? Thanks in advance
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1 month ago
#2
(Original post by Tee.Q)
Where do I even start? And someone show me the steps to do this please? Thanks in advance
Surely you can make a start? They have given you a function I so the first step is to differentiate it (and then a second time)
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Thread starter 1 month ago
#3
(Original post by davros)
Surely you can make a start? They have given you a function I so the first step is to differentiate it (and then a second time)
Someone sent me the solution but I just don't know how they got there.
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1 month ago
#4
(Original post by Tee.Q)
Someone sent me the solution but I just don't know how they got there.
OK, but can you make a start on the differentiation? What do you get for dI/dt?
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Thread starter 1 month ago
#5
(Original post by davros)
OK, but can you make a start on the differentiation? What do you get for dI/dt?
I'll try my best to get dI/dt
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Thread starter 1 month ago
#6
(Original post by davros)
OK, but can you make a start on the differentiation? What do you get for dI/dt?
I feel like I'm doing something wrong
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1 month ago
#7
(Original post by Tee.Q)
I feel like I'm doing something wrong
You need to use the product rule
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1 month ago
#8
(Original post by Tee.Q)
I feel like I'm doing something wrong
Unfortunately you are!

You have a product of 2 functions so you need to use the product rule to differentiate - does this ring any bells? Also you've brought out a 't' factor when I would expect either an 'a' or a 'w'
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Thread starter 1 month ago
#9
(Original post by B_9710)
You need to use the product rule
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Thread starter 1 month ago
#10
(Original post by davros)
Unfortunately you are!

You have a product of 2 functions so you need to use the product rule to differentiate - does this ring any bells? Also you've brought out a 't' factor when I would expect either an 'a' or a 'w'
ohhhh okay i will take out w when i differentiate it
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Thread starter 1 month ago
#11
(Original post by Tee.Q)
ohhhh okay i will take out w when i differentiate it
Am I on the right track?
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Thread starter 1 month ago
#12
ohhh you meant the a in -at to be taken out
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1 month ago
#13
(Original post by Tee.Q)
Am I on the right track?
Look at that first term again. What do you go when you differentiate ?
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Thread starter 1 month ago
#14
(Original post by B_9710)
Look at that first term again. What do you go when you differentiate ?
Do you get ?
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1 month ago
#15
(Original post by Tee.Q)
Do you get ?
That's right

Are you out of practice on these ?
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Thread starter 1 month ago
#16
(Original post by davros)
That's right

Are you out of practice on these ?
🤣🤣 I was fairly decent at these before quarantine but im forgetting a lot of stuff now. I will try getting the second derivative on my own but I don't know what it means when it says "show I(t) is a solution of of equation 1". And thank you guys for having patience with me. You're truly amazing
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Thread starter 1 month ago
#17
(Original post by davros)
That's right

Are you out of practice on these ?
I've now done the second derivative. What does it mean when it says "show that I(t) is a solution of equation 1"?
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1 month ago
#18
(Original post by Tee.Q)
I've now done the second derivative. What does it mean when it says "show that I(t) is a solution of equation 1"?
I haven't checked your derivatives. but it basically means that if you plug your expressions for d^2I/dt^2, dI/dt and I into the left hand side of equation (1) then you should find that things magically cancel out and you get 0 as the result
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1 month ago
#19
is this A level maths ?
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Thread starter 1 month ago
#20
(Original post by existentialdered)
is this A level maths ?
nope
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