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Core 3 Maths Differentiation Problem

Hi,

why does 6cos(3x)+6 / (1+cos3x)²

cancel down to 6 / 1 + cos3x ?
Reply 1
Avatar for Aph
Aph
22
Original post by Clankdroid
Hi,

why does 6cos(3x)+6 / (1+cos3x)²

cancel down to 6 / 1 + cos3x ?

It seems to me that you need to use the chain rule and the quotient rule.

What have you done so far :smile:

EDIT: this ain't differentiation. Factorise :smile:
Reply 2
Avatar for Clankdroid
Clankdroid
OP
1
Hi, this is the ending to an AQA core 3 question, I got to the top part but the final mark is for getting to the second part, I just don't get how that cancels down to that?
Reply 3
Avatar for Aph
Aph
22
Original post by Clankdroid
Hi, this is the ending to an AQA core 3 question, I got to the top part but the final mark is for getting to the second part, I just don't get how that cancels down to that?


Put the top into brackets.
Reply 4
Avatar for Clankdroid
Clankdroid
OP
1
Ah fgs, thank you so much I just didn't see it haha,

so 6(1 + cos3x) / (1 + cos3x)^2 ?
Original post by Clankdroid
Hi, this is the ending to an AQA core 3 question, I got to the top part but the final mark is for getting to the second part, I just don't get how that cancels down to that?


Top factorises to 6(1+cos(3x)) which then cancels with the bottom
Reply 6
Avatar for Clankdroid
Clankdroid
OP
1
Thank you guys

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