Yes. Would you care to fly in something designed by someone who had not had any training?
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It is important for all engineers to have at least a basic understanding of math. Most very specialized engineers need to have a very good understanding of math in order to do their jobs well and safely.
In air freight terms it would mean Freight Payable at Destination. Not at all sure how that ties in with Aerospace since those at the destination of aerospace deliveries are usually not in any position to pay the huge freight costs!
Physical therapists can always continue their training in order to be better at their job. They can receive on site training in outpatient facilities or hospitals.
You probably need to go to Bible school and then to some missionary training organization
Engineers use trigonometry anywhere that involves non-right angles. That includes building cars and buildings, bridges, and many other structures. they also use trigonometry when dealing with fields, like magnetic and electric fields. Also, trigonometry is very important with engineers who deal with waves, such as sound or light engineers.