There is a subtle difference between Arctan and arctan
Arctan(x) is an inverse function such that the range is only the principla value
meanwhile, arctan(x) takes on infinitely many values
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Answer: Gold jewellery pieces have been found as well as objects made locally using both copper and bronze, and a small number of glass beads, most likely from India and brought to the city by trans-Saharan camel caravans. Amongst the most interesting finds at Djenne-Djenno are terracotta sculptures.
Explanation:
The answer is number four, land
The slavery has been a human practice for several millenniums, and it was practiced all over the world.
Explanation:
The slavery is something that the humans from all over the world were practicing unfortunately. This practice continued for millenniums, and it only stopped relatively recently. the period between the 13th and 17th century is a very important one when it comes to slavery, as it spread out much more and started to be practiced not just locally, but regionally and even between different continents.
East Africa and West Africa were using lot of slaves, and they were mostly enslaving people that were conquered and from weaker tribes on the outskirts. They were forcing them to work in mining, or to lift and carry trade goods. Later, they started to sell slaves to the Europeans as they saw a great economic opportunity.
In Europe itself, the slavery was mostly found in the Balkan Peninsula, were the Ottomans were forcing the people to work for them, and took large percentage of their crops and money. The European nations that became imperial powers were buying slaves from Africa, and they moved them into the Americas, thus made it international slavery, establishing the Atlantic slave trade.
Southwest Asia in this period also had lot of slaves, most of which were people that didn't wanted to accept the Islam, so people of different religious backgrounds, of numerous ethnic and racial groups, that were caught, were enslaved and treated as animals.
Learn more about the Atlantic slave trade brainly.com/question/7655330
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