Alevel maths Rsin(x+alpha) question help

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Student boi
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Please can someone do question 6 on https://filestore.aqa.org.uk/resourc...Q-AM-2021.DOCX To see if we get the same answer for a and b , its the one with y=asinx +bsinx
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Plücker
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(Original post by Student boi)
Please can someone do question 6 on https://filestore.aqa.org.uk/resourc...Q-AM-2021.DOCX To see if we get the same answer for a and b , its the one with y=asinx +bsinx
Input your function in Desmos to see if it has the right properties. https://www.desmos.com/calculator
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mqb2766
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(Original post by Plücker)
Input your function in Desmos to see if it has the right properties. https://www.desmos.com/calculator
Is it just me or is there multiple solutions, assuming the max can occur after the point etc.
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DFranklin
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(Original post by mqb2766)
Is it just me or is there multiple solutions, assuming the max can occur after the point etc.
Without actually doing calculations, that was also my intuition. It's probably reasonable to use the graph to assume that's not the case, however.
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mqb2766
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(Original post by DFranklin)
Without actually doing calculations, that was also my intuition. It's probably reasonable to use the graph to assume that's not the case, however.
Sure, I would have expected them to say something like positive a, b.
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DFranklin
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(Original post by mqb2766)
Sure, I would have expected them to say something like positive a, b.
Have to say, my expectations are pretty damn low looking at what's been posted recently...
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Plücker
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(Original post by mqb2766)
Is it just me or is there multiple solutions, assuming the max can occur after the point etc.
Just had a quick look. I got two solutions but one of them is a curve that goes through (0,0).

Solutions of a^2+b^2=16 and 2\sqrt{3}=\frac{\sqrt{3}}{2}a+\frac{1}{2}b
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mqb2766
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(Original post by Plücker)
Just had a quick look. I got two solutions but one of them is a curve that goes through (0,0).

Solutions of a^2+b^2=16 and 2\sqrt{3}=\frac{\sqrt{3}}{2}a+\frac{1}{2}b
Thats what i thought. You can pretty much write down the trig answers, or as you say, they probably wanted the circle intersection solutions
Last edited by mqb2766; 1 month ago
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