A Value of Sinh X or Cosh X Is Given $\cosh x = \frac { 17 } { 8 } , x < 0 , \operatorname { sech } x =$

question 72

Multiple Choice

A value of sinh x or cosh x is given. Use the definitions and the identity cosh²x - sinh²x = 1 to find the value of the
other indicated hyperbolic function.
- $\cosh x = \frac { 17 } { 8 } , x < 0 , \operatorname { sech } x =$

• A) \(- \frac { 289 } { 64 }\)
• B) \(\frac { 8 } { 17 }\)
• C) \(- \frac { 8 } { 15 }\)
• D) \(\frac { 15 } { 17 }\)

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