Tee.Q
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Where do I even start? And someone show me the steps to do this please? Thanks in advanceName:  Screenshot 2020-11-30 203105.png
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davros
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(Original post by Tee.Q)
Where do I even start? And someone show me the steps to do this please? Thanks in advanceName:  Screenshot 2020-11-30 203105.png
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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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Tee.Q
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(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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(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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Tee.Q
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(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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Tee.Q
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(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 Name:  20201130_205656-compressed.jpg.jpeg
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B_9710
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(Original post by Tee.Q)
I feel like I'm doing something wrong Name:  20201130_205656-compressed.jpg.jpeg
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You need to use the product rule
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davros
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(Original post by Tee.Q)
I feel like I'm doing something wrong Name:  20201130_205656-compressed.jpg.jpeg
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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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Tee.Q
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(Original post by B_9710)
You need to use the product rule
My bad. Thanks
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Tee.Q
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(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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Tee.Q
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(Original post by Tee.Q)
ohhhh okay i will take out w when i differentiate it
Name:  20201130_211402-compressed.jpg.jpeg
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Tee.Q
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ohhh you meant the a in -at to be taken out
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(Original post by Tee.Q)
Name:  20201130_211402-compressed.jpg.jpeg
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Look at that first term again. What do you go when you differentiate  e^{-at} ?
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Tee.Q
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(Original post by B_9710)
Look at that first term again. What do you go when you differentiate  e^{-at} ?
Do you get  -ae^{-at} ?
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davros
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(Original post by Tee.Q)
Do you get  -ae^{-at} ?
That's right

Are you out of practice on these ?
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Tee.Q
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(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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Tee.Q
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(Original post by davros)
That's right

Are you out of practice on these ?
Name:  20201201_020825-compressed.jpg.jpeg
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Size:  43.4 KB 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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(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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username5491034
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is this A level maths ?
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Tee.Q
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(Original post by existentialdered)
is this A level maths ?
nope
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