Thursday: diagramming someone else's code sucks

As does not having any pictures.

• Pandas.
• Liberating the baked good proletariat.
• I think this falls under the "duh" category.  Of course going from six major carriers to three over the past decade or so reduces competition and increases prices.
• Except Pyramid Head is never found outside, if I recall correctly.
• Other than the odd story problem wrapping, this is a pretty good problem.  The equation given in the description should make it obvious that the solutions a(t) and b(t) are sine and cosine, based on the trigonometric identity.  That also points out that the solution is an orbit on a circle.  Part (a) is just the chain rule and algebra.  The hint in (b) is just the consequence of a(t) and b(t) being sine and cosine, and tells you that b(t) is the cosine one.  (c) is just more algebra, and (d) is basically making the plot.  I like this problem.