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Hashes of the same data are always the same. However, the data inside a transaction is not always the same. A transaction includes a signature, which includes random numbers thus the data is not always known so the hash cannot be calculated without actually creating and signing a transaction.
I'm asking if the Bitcoin's transaction hashes are random or can be calculated ?.
A transaction hash is the hash of the transaction. A "hash" is a computation that is done on data and results in a value that has useful properties, including relative uniqueness, the appearance of randomness, and an inability to recreate the original data.
In Bitcoin, transaction hash = SHA256(SHA256(transaction))
So ? can it be calculated OR NOT
Like if you give me your btc address and i wanted to send you 5$ But i want to know AND CALCULATE the tx hash before sending the payment to you is it possible ? 
I'm asking if the Bitcoin's transaction hashes are random or can be calculated ?.
A transaction hash is a hash of the transaction. A "hash" is a computation that is done on data and results in a value that has useful properties, including relative uniqueness, the appearance of randomness, and an inability to recreate the original data. A transaction hash is also known as a transaction ID, or txid.
In Bitcoin, transaction hash = SHA256(SHA256(transaction))
Not very much familiar with cryptography, as I'm just starting to get my grasp of it, but I think that it is not randomly generated and some algorithms are required to produce such a hash. See this page for more info. If hashes are randomly calculated in bitcoin, then algorithms would be pretty much useless in this case.
Thank brother & i'm waiting for a clear answer , i wonder if we really are able to calculate all the hash or just the first part of its ?
Not very much familiar with cryptography, as I'm just starting to get my grasp of it, but I think that it is not randomly generated and some algorithms are required to produce such a hash. See this page for more info. If hashes are randomly calculated in bitcoin, then algorithms would be pretty much useless in this case.
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