Mk, I'm really not sure about this one. If it helps here is the multiple choice: If sinhx=8/15, find the values of the other hyperbolic functions at x.

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Mk, I'm really not sure about this one. If it helps here is the multiple choice: If sinhx=8/15, find the values of the other hyperbolic functions at x.

Mathematics
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Use the relation:\[\cosh^2(x)-\sinh^2(x)=1\]
there are other relations you can use as well, e.g.:\[\tanh^2(x)=1-sech^2(x)\]\[\coth^2(x)=1+csch^2(x)\]

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Well from elimination, it can only be 2 or 4 since sinhx=8/15, So cosh^2x = 8/15 + 1, correct?
correct?
not quite:\[\cosh^2(x)=1+\sinh^2(x)=1+\frac{64}{225}=\frac{289}{225}\]therefore:\[\cosh(x)=\sqrt{\frac{289}{225}}=\frac{17}{15}\]

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