I read somewhere that TrustWallet user has access to the private keys of each coin supported by the wallet. It was required to save a twelve word seed at first creating the wallet, but i didn't find here to find my private keys for eth and bitcoin.
You can use
iancoleman.
Enter your 12-word phrase. Then you will see all your private keys and the extended private key as well.
Note than since trust wallet uses bech32 format for bitcoin addresses, you must select BIP84.
I was surprised that trustwallet supports bech32 addresses but i can't find where to change the receiving address.
I have never received any bitcoin in trustwallet. But I guess once you receive a payment, the receiving address will change.
If you wish to see your other addresses, you can see them using
iancoleman.
In the exchange menu, i was looking to exchange my deposit in eth to btc. I didn't find available eth/btc pairs available. Seems that eth exchange is only available to be exchanged with ERC20 tokens supported by the wallet.
I am not sure but I think one of pairs must be Binance or its token.