P.T cosh^(2)x+sinh^(2)x=cosh2x...

P.T `cosh^(2)x+sinh^(2)x=cosh2x`

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P.T cosh^(2)x+sinh^(2)x=cosh2x
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Prove that cosh3x=4cosh^(3)x-3coshx
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Prove that (coshx+sinhx)^(n)=cosh(nx)+sinh(nx)
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If coshx=3//2, then find the value of (i) sinh2x (ii) cosh2x
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IF sinhx=5, then S.T x=loge(5+sqrt26)
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If tanhx=1//4," then prove that "x=(1)/(2)log(e)((5)/(3))
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Prove that sinh(x+y)=sinhxcoshy+coshxsinhy
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Prove that coth(x-y)=(cothx.cothy-1)/(cothy-cothx)
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