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FAQ
TA is the time for the path AB.
TC is the time for the path CD.
TA=√(2/g){[((1/sinθ)-(1/cosθ))√(Asinθ)]+(1/cosθ)√(Asinθ+Bcosθ)}
TC=√(2/g){[-((1/sinθ)-(1/cosθ))√(Bcosθ)]+(1/sinθ)√(Asinθ+Bcosθ)}