At night, Ji Qingze looked at the young man's face in the night.
"Ping An... Can you help me guide..."
Zhang Pingan looked at him slightly embarrassed.
"Ah? Are you sure... This is not good..."
"Please... Be safe, just this once..."
"Uh... Okay..."
Zhang Pingan slowly stretched out his hand... And hit Ji Qingze on the head.
"I've told you several times! The derivative of cosX is -sinX! The derivative of lnX is 1/X. Why can't you remember it when it's your turn to find the derivative?"
"..."
"If you don't remember it next time, I'll twist your head off!"
Ji Qingze put his head in front of Zhang Ping'an and said with a wicked smile:
"Okay, I wonder if you want to tighten the top part or the bottom part?"
In a moment, the pillow on the bed hit the back of Ji Qingze's neck.
"Go away!!!"
[New book, comedy! Funny! Two male protagonists!
Intention: Love grows stronger and stronger as it grows
