Mathematics
OpenStudy (anonymous):

If cosh x= 5/3 with x<0, find the values of the other five hyperbolic functions.

OpenStudy (anonymous):

like with sine and cosine but instead use $\cosh^2(x) - \sinh^2(x) = 1$so $\sinh^2(x)=\cosh^2(x)-1$ $\sinh(x)=\pm\sqrt{\cosh^2(x)-1}$ substitute and get $\sinh(x)=-\frac{4}{3}$ (negative because x is)

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