Knowing that 123-45-67+89=100, write a function that gives this result for any order of the digits in the input. Otherwise, the function should give 'NaN'.
Replace NaNs with the number that appears to its left in the row.
Roll the Dice!
Back to basics 18 - justification
CONVERT TAN TO SIN
Say type of roots in quadratic equation
Approximate the inverse tangent by power series
Double the next!
Ratio between sum of primer numbers and non-prime numbers
Ratio between sum of primes and sum of factors
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