Inverse trigonometric functions - arcsin, arccos, arctg, arcctg (international notation: sin^(-1)x, cos^(-1)x, tg^(-1)x, ctg^(-1)x. Hints, how to get inverse trigonometrics function vaules using elementary table of trigonometric values.
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CORRECTION: In video there is ctg(-x)=ctg(x), but of course should be: ctg(-x)=-ctg(x)). I'm sorry for my mistake. Here's corrected PDF:
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