91Ó°ÊÓ

Evaluate coth \(0.38\), correct to 3 decimal places.

Solve the equation \(\operatorname{cosech} y=-0.4458\), correct to 4 significant figures.

A chain hangs in the form given by \(y=40 \operatorname{ch} \frac{x}{40}\). Determine, correct to 4 significant figures, (a) the value of \(y\) when \(x\) is 25 , and (b) the value of \(x\) when \(y=54.30\)