Edexcel F3 2018 June — Question 1

Exam BoardEdexcel
ModuleF3 (Further Pure Mathematics 3)
Year2018
SessionJune
TopicHyperbolic functions
  1. Solve the equation
$$15 \operatorname { sech } ^ { 2 } x + 7 \tanh x = 13$$ Give your answers in terms of simplified natural logarithms.
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