I would say both are correct.
Indeed they are, but I detect a very slight difference: take suggests more effort on the part of the looker.
Example:
[Two people are sitting at a table, each reading different newspapers. One sees an article that would interest the other.]
Have a look at this.
[Two people are sitting at separate tables, at opposite ends of a room. The one who says
Take a look at this
knows that he's asking the other person to get up and walk across the room.]
b
Thnaks for the this clarification . I uderstand thr different .
you know,
your way of teaching is sooo good, this is the first time i understand something so quick .!
thanks for your effort