Radek: Bro i have another question T_T i know you wanna kick my ass...
Radek: Can i ask?
Artur: Haha
Artur: No worries
Artur: Sure, ask, I will answer as soon as I get some time
Artur: If I know the naswer :D
Radek: Bro in the previous homework you used this equasion, let me take a picture, it will be faster
Radek: <file_picture>
Radek: did you mean this
Radek: <file_picture>
Artur: Yeah
Artur: Did I really use the first one? Really :D?
Artur used the wrong equation in his previous homework, which Radek noticed.