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FP1 General solution Watch

1. I've done this question, but the answer I get is different to the mark scheme.

LET # = pi

It's jan 2011 AQA - Sin(4x-2#/3)=-0.5

I've used x = 2#n + principal value to give me x = #n/2 + 1/8# which is right

but then when using 2#n + # - principal value I got #n/2 + 11/24# and the right answer is #n/2 - 1#/24

could someone help?
2. (Original post by Antheran)
I've done this question, but the answer I get is different to the mark scheme.

LET # = pi

It's jan 2011 AQA - Sin(4x-2#/3)=-0.5

I've used x = 2#n + principal value to give me x = #n/2 + 1/8# which is right

but then when using 2#n + # - principal value I got #n/2 + 11/24# and the right answer is #n/2 - 1#/24

could someone help?
I think your answer is equivalent to the mark scheme. You get the same angles. Your n=1 gives the same as their n=2 etc.

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