Original post by joyoustele
How can I show
Stuck
Stuck
Use
Original post by joyoustele
How can I show
What I did
Stuck
What I did
Stuck
Have you tried using cos 2A = 2cos^2 A - 1 so cos^A = ...
Original post by RDKGames
Use
Oh
... Thanks a lotOriginal post by RDKGames
Use
You need to explain where that comes from as it's not a given identity.
Original post by Muttley79
You need to explain where that comes from as it's not a given identity.
I know. where it's from its just 1/2 of cos2x, then rearranged for cos^2x
Original post by Muttley79
You need to explain where that comes from as it's not a given identity.
Identity for obviously. OP is good enough to figure that one on their own.
Original post by RDKGames
Identity for obviously. OP is good enough to figure that one on their own.
Yes but if you just do as you suggest marks would be lost -
Original post by Muttley79
Yes but if you just do as you suggest marks would be lost -
Maybe, maybe not. The fact remains that I'm not telling them what to write word for word in an exam. That's up to them to formulate. I only stated what they need to use.
Original post by joyoustele
I know. where it's from its just 1/2 of cos2x, then rearranged for cos^2x
Yes but you woud need to show this or you will lose marks
Original post by RDKGames
Maybe, maybe not. The fact remains that I'm not telling them what to write word for word in an exam. That's up to them to formulate. I only stated what they need to use.
That's not helpful imho - C3 marking is extremly strict on these questions. If you don't give a reason you lose marks - fact.
Original post by Muttley79
Yes but you woud need to show this or you will lose marks
Dw, I always show my workings
TY for the help. I highly appreciate it
Original post by joyoustele
Dw, I always show my workings
TY for the help. I highly appreciate it
TY for the help. I highly appreciate it
The mark scheme is usually particularly harsh for this topic - explain in words what you are doing.
Original post by Muttley79
The mark scheme is usually particularly harsh for this topic - explain in words what you are doing.
On here?
Original post by joyoustele
On here?
No, in the exam- but any hints on here should model good practice; hence my comment to RDKGames.
Original post by Muttley79
No, in the exam- but any hints on here should model good practice; hence my comment to RDKGames.
Okay, Thanks...Im trying to go for an A* I dont want to lose any marks, Thanks a lot.
Original post by joyoustele
Okay, Thanks...Im trying to go for an A* I dont want to lose any marks, Thanks a lot.
Well you definitely don't need to explain anything 'in words' to get an A* so don't worry about this too much.
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