3 deleted 71 characters in body; edited tags

I'veI have been trying to solve this question for couple hours and I still don't get it. The problem I'm trying to solve is 6.14 in the link below.

and I've also includedThis is what I'veI attempted so far which:

I've been trying to solve this question for couple hours and I still don't get it. The problem I'm trying to solve is 6.14 in the link below.

and I've also included what I've attempted so far which I'm sure is wrong because I don't understand it. Someone please help me :( Thank you!

I have been trying to solve this question for couple hours and I still don't get it. The problem I'm trying to solve is 6.14 in the link below.

This is what I attempted so far:

I'm sure this is wrong, but I don't know the right answer.

2 embedding images

# Formal Proofsproofs using subproofs

I've been trying to solve this question for couple hours and I still don't get it. The problem I'm trying to solve is 6.14 in the link below.

and I've also included what I've attempted so far which I'm sure is wrong because I don't understand it. Someone please help me :( Thank you!

# Formal Proofs using subproofs

I've been trying to solve this question for couple hours and I still don't get it. The problem I'm trying to solve is 6.14 in the link below.

http://imgur.com/a/rgzaz

and I've also included what I've attempted so far which I'm sure is wrong because I don't understand it. Someone please help me :( Thank you!

# Formal proofs using subproofs

I've been trying to solve this question for couple hours and I still don't get it. The problem I'm trying to solve is 6.14 in the link below.

and I've also included what I've attempted so far which I'm sure is wrong because I don't understand it. Someone please help me :( Thank you!

1

# Formal Proofs using subproofs

I've been trying to solve this question for couple hours and I still don't get it. The problem I'm trying to solve is 6.14 in the link below.

http://imgur.com/a/rgzaz

and I've also included what I've attempted so far which I'm sure is wrong because I don't understand it. Someone please help me :( Thank you!