" (ii) "(cosh x+sinh x)^(n)=cosh(nx)+sinh(nx)," for any "n in R

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Prove that (coshx-sinhx)^(n)=cosh(nx)-sinh(nx)

Prove that (coshx+sinhx)^(n)=cosh(nx)+sinh(nx)

("Cosh"2+sinh2)^(n)=

Cosh(2x) + sinh(2x) =

cosh 2 + sinh 2 =

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

sinh(cosh^(-1)x)=

cosh^(4)(x)-sinh^(4)(x)=