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# C3 proving trig identity help please. watch

1. ..
2. Note that and use .
3. (Original post by Farhan.Hanif93)
Could I possibly have another prompt because once I use , I get:
Well, use on the term, and then multiply all the brackets out and see what you're left with. You'll then probably need to use .
4. It's easier to prove the reverse instead. Start from the RHS.
5. An alternative approach is to consider the identity (2sin^2x + 2cos^2x)^2 = 4.
6. Hey, basically in need of someone making me feel a hell of a lot better!...I've finished 6th form but had to retake maths, both C3 and C4! I need 240 ums to go to uni so need to get my maths from an e to a d which i'm just one mark away from! So if last year in c3 I got 36/100 ums...and i've worked out that for the C3 exam taken this year on the 20th I've got 34/75....how many ums marks is this please!!!
7. (Original post by sachagaray)
Hey, basically in need of someone making me feel a hell of a lot better!...I've finished 6th form but had to retake maths, both C3 and C4! I need 240 ums to go to uni so need to get my maths from an e to a d which i'm just one mark away from! So if last year in c3 I got 36/100 ums...and i've worked out that for the C3 exam taken this year on the 20th I've got 34/75....how many ums marks is this please!!!
If you got lower in your C3 exam this year, then your old mark of 36/100 still counts towards your maths A-level.

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Updated: January 25, 2010
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