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Given that x=sinht and y=-cosht.
find: dx/dy
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dy/dx = ([d/dy]y(t)) / ([d/dt]x(t))
[d/dt]x(t) = [d/dt]sinh(t)=cosh(t)
[d/dt]y(t) = [d/dt]-cosh(t)=-sinh(t)
dy/dx = -sinh(t)/cosh(t)
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