Fitzpatrick, conics, 32(c) Q 14 (1 Viewer)

edd91

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If you have the fitz book can you have a look
on my worked solutions the photocopy is broken at the bottom
it goes from:
Mpq= bsin(fi) - bsin@/acos(fi) - acos@

the next step is
2bcos((fi) + @)/2)sin(Fi-@/2)/something???
i dont know what the something is, and how they got that numerator, can anyone shed some light
 

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