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[Core] 求解1989ce paper2

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求解1989ce paper2

https://docs.google.com/file/d/0By_fBXid_HcUamh0NENUTVVQclk/editQ23 如何證明II 係正確?
Q46唔識do help ans係C
   

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Q23: Draw a line from O to mid-point of BC (lets call it Y for now). We then know by applying the property "line from centre perpendicular to chord bisects chord" that BY = CY and FY = GY. Therefore, BF = BY - FY = CY - GY = CG

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46. There seems to be a typo in the first term. It should mean 2(sin theta)^2.
Divide the whole equation by (cos theta)^2, then you get a quadratic in tan theta.



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