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# C4 integration watch

1. I need help with k😭

2. partial fractions is a good way to start. you didn’t get it quite right and some other stuff too. i’ve uploaded my solution
3. Attachment 774912
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4. sorry ignore the binomial expansion screenshot
5. (Original post by graecusthegreek)
partial fractions is a good way to start. you didn’t get it quite right and some other stuff too. i’ve uploaded my solution
Oh my god, you're literally a life saver. Thank you so much, thought I'd be stuck on this forever😅. Xx
6. (Original post by Danielnovels25)
Oh my god, you're literally a life saver. Thank you so much, thought I'd be stuck on this forever😅. Xx
no problem if you want anymore help just @ me
7. (Original post by graecusthegreek)
no problem if you want anymore help just @ me
I need help with L, I'm so sorry.

[attach]774916[/attach
][attach]774916[/attach
]
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9. send as many probelsm as you want!
10. tell me if you can't read something also don't apologize silly
11. the integral of cosec²x is a standard integral. not sure if it's in the formula booklet or not
12. (Original post by graecusthegreek)
Wow, thank you so much again! Do you have any tips on how to know if your answer is right on the exam? Like, I obviously won't have the actual answer in the exam to check my answer, so how do I know if my answer is the actual answer?
13. (Original post by Danielnovels25)
Wow, thank you so much again! Do you have any tips on how to know if your answer is right on the exam? Like, I obviously won't have the actual answer in the exam to check my answer, so how do I know if my answer is the actual answer?
do you have a calculator that can do numerical integration?
I usually just use my calculator to integrate the expression between 0 and 1 (or some other domain) and see what answer I get. I then put in the same limits for my answer. if they're the same then I'm pretty sure I've integrated correctly. does this make sense? I can go through an example if you want
14. let's say I want to integrate x (silly I know but it works as an example). I do some integration and think it's x²/3. so I go on my calculator and integrate x between 0 and 1 which would give me ½. but if I put in the limits 0 and 1 into my answer (x²/3) I would get ⅓ which isn't the same answer, so I know I've gone wrong somewhere. make sense?
15. (Original post by graecusthegreek)
do you have a calculator that can do numerical integration?
I usually just use my calculator to integrate the expression between 0 and 1 (or some other domain) and see what answer I get. I then put in the same limits for my answer. if they're the same then I'm pretty sure I've integrated correctly. does this make sense? I can go through an example if you want
Yup, makes sense. Thank you sooooooooo much, honest. 🙏🏾😊😊😊
16. (Original post by Danielnovels25)
Yup, makes sense. Thank you sooooooooo much, honest. 🙏🏾😊😊😊
no problem
17. @graecusthegreek I promise, I PROMISE this is the last one. M

[attach]774924[/attach
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18. (Original post by graecusthegreek)
X
19. (Original post by Notnek)
sorry i didn’t realise!
20. (Original post by graecusthegreek)
sorry i didn’t realise!
Can u help with question m? I tried replacing all the x values in terms of u, but that didn't work. And then I tried saying y=x-2 and that didn't work either. :/

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