Replace NaNs with the number that appears to its left in the row.
Create a square matrix of multiples
Magic is simple (for beginners)
Do Fast Fourier Transformation
Divisible by 5
Find cosine between two given vectors u and v.
Display positive elements of matrix.
For given vectors x,y find coresponding spline coefficients.
Calculate the values of a polynomial.
Find hen's weight.
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