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# C3 Edexcel January 2008 Q 7 watch

1. I can't get four soultions for qustion 7 part c) I can only get - 0.46

Qusetion:

http://www.edexcel.com/migrationdocu...e_20080117.pdf

Mark Scheme:

http://www.edexcel.com/migrationdocu...s_20080306.pdf

Thanks
2. It's sin(2x+ alpha). Therefore 'round the CAST wheel' twice, that way you'll get 4 answers, then minus the value of alpha and divide by two. When you do that, two answers will be above the limits; the answers which are above the limit, take away 2pi from that, and that will give the negative solutions.
3. (Original post by v1oXx-)
It's sin(2x+ alpha). Therefore 'round the CAST wheel' twice, that way you'll get 4 answers, then minus the value of alpha and divide by two. When you do that, two answers will be above the limits; the answers which are above the limit, take away 2pi from that, and that will give the negative solutions.

Thanks a lot

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