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
hope this helps
West Virginia's leading industry, coal, underwent wrenching changes. In the early stages of the Depression, the industry suffered from a virtual collapse as mining companies failed and unemployment grew, leaving once busy coal camps idle and stranding thousands of miners and their families.
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