N.B. For the purpose of this exercise, the first Fibonacci number is 1, and the second is 2; that is, fib(1) = 1 and fib(2) = 2 .
Make a function isfib(x) so that:
5.731478440138172e+20 from 7th test is not a Fibonacci Number. 100th Fibonacci Number in proposed convention is 573147844013817084101 which has 21 digits and exceeds double precision.
given 3 sides, find area of this triangle
Angle of triangle
Construct a string from letters and counts
middleAsColumn: Return all but first and last element as a column vector
Side of an equilateral triangle
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