Let :

.

Prove:

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- Feb 23rd 2011, 12:40 PMarmequality trigonometry
Let :

.

Prove: - Feb 23rd 2011, 02:21 PMmestmoha

and

let's take such that:

is defined as:

We have now:

Hence,

1) and 2) are not valid because they violate

3) and 4) gives us:

thus,