Difficult yet simple: Part 1
For those who take or took maths, you would probably know the following trignometric identity:
But can you complete and prove the identity below?
Tip: find out what cosh x and sinh x are defined by first.
But can you complete and prove the identity below?
Tip: find out what cosh x and sinh x are defined by first.
posted by Eau at 11:56 pm
3 Comments:
sinh x = 1/2 (e^x - e^-x)
cosh x = 1/2 (e^x + e^-x)
so, sinh^2 x + cosh^2 x = 1/2 (e^2x + e^-2x)
Is that right????
note: ^=power :D
zilko,
yep, you're essentially correct :) nice job
note: in identities, we usually define the domain as well as the function, so for all these three identites:
x is an element of the real numbers
F.
Woa, forgot to write the domain... x E R :)
PS--------------
Really?? Actually the dolphins in the vid are not very clear, pretty small (actually they are big enough if we watch them live, but because it's a recorded video by cellular phone, they are only looked small)... . There are some dolphins actually... :)
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