s='He was so tired'
ans = true
Test for balanced parentheses
Back to basics 14 - Keywords
Angle between two vectors
Deleting an element in a matrix
Find scalar product of two polynomials a and b, given as vector array.
Find Adjacency Matrix
Return the length of the longest word in the string.
Solve the following system of equations.
Return ! if array element starts with a certain letter. Otherwise return ?
Create cotangent function out of sine.
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