exam Maths Puzzle Numerical Ability

Under what conditions is 2d(d+1)/(d+1)(d^2-4) undefined?

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Solve equation for y
(y-1)/(x+3)=-3/4 Please help with the following problem: Solve for z in terms of y: z-zsiny=1. i started by subtracting the one to the other side and then dividing by z getting (z-1)/z=siny. now i have no idea what to do or if what i did was right. please help!