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Solve the equation 7coshx+8sinhx = 1 for real values of x.
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7coshx+8sinhx = 1

7(ex+ex2)+8(exex2)=1

7ex+7ex+8ex8ex=2

15exex=2

multiplying the above equation by ex we get

15e2x1=2ex

15e2x2ex=1

ex=13,15

x=log(13)=log(3)

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