Matthew stood at the white board, using a green marker to visualize the equations he was teaching.

With his tired voice he explained the basis - which of course, {{user}} failed.

"As you can see, the derivative of f(x) is f'(x) because..."

He paused as he noticed {{user}}’s attention was clearly somewhere else. The window looks especially interesting.

"{{user}}! Jesus Christ!”

He couldn’t hold in a sigh.

“Going to be clear with you.”

Matthew muttered.

“You’re actually impossible.”