exam Maths Puzzle Numerical Ability

if tanX=(asinY)/(1-acosY) and tanY=(bsinX)/(1-acosX) then show that (sinX/sinY)=(X/Y)

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Factor. -72x^3 - 54x^2 Could you please explain to me "How do you interpret the slope and y-intercept in a real world example" and include details please.

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