Return the sum of sum(res.y)
Tip: use bvp4c
Back to basics 23 - Triangular matrix
Matrix to column conversion
Given the variable x as your input, multiply it by four, then divide it by two. Then put the result in y.
Create cotangent function out of sine.
Calculate the eigenvalues of A.
Find the Sum of the Series:
Find the sum of the negative elements under the main diagonal.
Return ! if array element starts with a certain letter. Otherwise return ?
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