Tommorow i have exam mathematic and i need to prove that:

a) cosh(x+y)=cosh(x)cosh(y)+sinh(x)sinh(y)

b) sinh2(x)= 1/2 (cosh(2x)-1)

* in b) sinh 2 is square. 1/2 one half.

I need to solve this problem tonight.

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- October 29th 2009, 10:13 AMmarkomkHow to prove that:
Tommorow i have exam mathematic and i need to prove that:

a) cosh(x+y)=cosh(x)cosh(y)+sinh(x)sinh(y)

b) sinh2(x)= 1/2 (cosh(2x)-1)

* in b) sinh 2 is square. 1/2 one half.

I need to solve this problem tonight.