(tanh(x))/(sech(x)-1)+(tanh(x))/(sech(x)...

`(tanh(x))/(sech(x)-1)+(tanh(x))/(sech(x)+1)=`

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The correct Answer is:

`-2" cosech"x`

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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-HYPERBOLIC FUNCTIONS -EXERCISE - 9(a)

If sinhx = 3/4 then find cosh 2x and sinh 2x.
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If sin hx = 3, then show that x = Log(e) (3+sqrt(10)).
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Prove that tanh(x-y)=(tanhx-tanhy)/(1-tanhxtanhy)
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Prove that coth(x-y)=(cothx.cothy-1)/(cothy-cothx)
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Prove that (coshx-sinhx)^(n)=cosh(nx)-sinh(nx)
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Prove that (coshx+sinhx)^(n)=cosh(nx)+sinh(nx)
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(tanh(x))/(sech(x)-1)+(tanh(x))/(sech(x)+1)=
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Prove that (coshx)/(1-tanhx)+(sinhx)/(1-cothx)=sinhx+coshx," for "xne0
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Prove that cosh^(4)x-sinh^(4)x=cosh2x
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If x = log [ tan (pi/4 + theta/2 ) ] then cosh x =
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