a level quotient rule…again

esha06

i got this far…i feel like i’m so close yet so far

https://imgur.com/a/VwCmHYb

(edited 11 months ago)

Reply 1

mqb2766

Original post by esha06

i got this far…i feel like i’m so close yet so far
https://imgur.com/a/VwCmHYb

You cant just cancel one of the terms on the numerator. But you have cos^2 + sin^2 on the numerator and pythagoras would be turning in his grave if you didnt ...

Reply 2

esha06

Original post by mqb2766

You cant just cancel one of the terms on the numerator. But you have cos^2 + sin^2 on the numerator and pythagoras would be turning in his grave if you didnt ...

omggggg i didn’t even notice that 😅😅😅😅

Reply 3

Oli.bx

Original post by esha06

i got this far…i feel like i’m so close yet so far
https://imgur.com/a/VwCmHYb

A very easy way to do quotient rule if you're struggling with it is to make the term (in this instance) cos(2x)[1+sin(2x)]^-1 and then do a product rule on it with chain rule (e.g becoming [2sin(2x)]/[1+sin(2x)] - [2cos^2(2x)]/[1+sin(2x)]^2). You can simplify further if needed.

Reply 4

aamina.hs

Original post by esha06

i got this far…i feel like i’m so close yet so far
https://imgur.com/a/VwCmHYb

Hi i did this as well and wanted to check i got the right answer. Did you get 2 as the numerator?

Reply 5

esha06

Original post by aamina.hs

Hi i did this as well and wanted to check i got the right answer. Did you get 2 as the numerator?

this is the mark scheme it’s acc -2

https://imgur.com/a/YbfARTG

Reply 6

aamina.hs

Original post by esha06

this is the mark scheme it’s acc -2
https://imgur.com/a/YbfARTG

oh yeah sorry i put the minus in front of the fraction thank you!!

Reply 7

math-path

Original post by Muttley79

Don't post solutions - it's not allowed - edit!

That's not the solution, it just shows what he already showed in (https://imgur.com/a/VwCmHYb line 5)
but you can better see the use of s^2+c^2=1 (which someone else already mentioned here) to simplify further.

(edited 11 months ago)

Reply 8

Muttley79

Original post by math-path

You should not be posting detail - just hints - read the rules

Reply 9

math-path

Original post by Muttley79

You should not be posting detail - just hints - read the rules

The rules states and I quote:
"Offer hints to guide the student. Full solutions will normally be removed."
You can certainly post details as long as it is not the full solution. What I provided was already mentioned just better organized to see where to use that identity.

(edited 11 months ago)

Reply 10

Muttley79

Original post by math-path

A hint is a verbal comment not a copied section of the solution. Remove please.

(edited 11 months ago)

Reply 11

esha06

Original post by Muttley79

A hint is a verbal comment not a copied section of the solution. Remove please.

i don’t think he meant it as a copy he just meant it as a correction of my working out
the guy before him basically said the same thing this guy just actually wrote it out

Reply 12

Muttley79

Original post by esha06

i don’t think he meant it as a copy he just meant it as a correction of my working out
the guy before him basically said the same thing this guy just actually wrote it out

Yes the first post was OK posting part of the solution ike this isn't - you could look up the answer yourself and there is no explanation to further your understanding.