(tan h x)/(sec h x - 1) + (tan hx)/(sec ...

`(tan h x)/(sec h x - 1) + (tan hx)/(sec h x + 1) =`

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(tan h x)/(sec h x - 1) + (tan hx)/(sec h x + 1) =
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("cosh x")/("1 -tanhx") + ("sinh x")/( "1 - coth x") =
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Prove that cosh2x=2cosh^(2)x-1
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Prove that cosh(2x)-1=2sinh^(2)x
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If theta in ((-pi)/(4), (pi)/(4)) and x=log(e )[cot((pi)/(4)+theta)] ...
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If coshx=sectheta " then prove that "tanh^(2).(x)/(2)=tan^(2).(theta)...
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