Find the Derivative Of $y = \tanh ( 7 x )$

question 54

Multiple Choice

Find the derivative of $y = \tanh ( 7 x )$ .

• A) \(\frac { 7 } { \cosh ^ { 2 } ( 7 x ) }\)
• B) \(- \frac { 7 } { \cosh ^ { 2 } ( 7 x ) }\)
• C) \(\frac { 7 \left( \cosh ^ { 2 } ( 7 x ) + \sinh ^ { 2 } ( 7 x ) \right) } { \cosh ^ { 2 } ( 7 x ) }\)
• D) \(- \frac { 7 \left( \cosh ^ { 2 } ( 7 x ) + \sinh ^ { 2 } ( 7 x ) \right) } { \cosh ^ { 2 } ( 7 x ) }\)

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