Hi, can someone please help me prove this: I used eulers formula for complex numbers but i ended up with please help or provide any guidance thanks\ you!!
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Originally Posted by Dgphru Hi, can someone please help me prove this: I used eulers formula for complex numbers but i ended up with please help or provide any guidance thanks\ you!! Ok, so Euler it is: for . Now sum up both these equations: . OTOH, the definition of the hyperbolic cosine is: . Well, now just put intead of and compare with the above... Tonio
Let Then: because cosh is an even function. So basically, since both cos and cosh are even functions, we have that: and
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