The Answer by sandwood12
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No AI - This artwork was created entirely by hand or with traditional digital tools.

Comments (5)
Like this i see the professor not the board :-)))
Let me see... this is tang(cosinus(teta)/sinus(alpha)) by ... oops... heu... 8) 5++
perfect!!!!!!!
Let's see here delta-v of the present cleft showing is....... LOL! Nicely done.
It would have to be hard to focus on the problem :)