Сравните:
1). arcsin корень 2/2  и  arccos корень 2/2
2). arcsin 1/2 и arctg 1
3). arccos( - корень 3/2) и arctg 1/ корень3
4).arcctg ( - корень3)  и  arctg ( - корень3)
5). arcctg (-1)  и  arctg (-1)








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