Return 'on' or 'off'
Reverse a string
Matrix of almost all zeros, except for main diagonal
Find the area of a triangle
Opposite task convert binary numbers array into array of decimal numbers.
Convert array of decimal numbers into binary numbers array.
Convert array of decimal numbers into hexadecimal numbers array.
Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Calculate roots of polynomial given as vector array.
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