There are of course several trac tickets related to this, so this is
not a bug report (for Sage or for Maxima), but I had to laugh when
this came up today in preparing for class - enjoy!

TypeError: Computation failed since Maxima requested additional
constraints (try the command 'assume(sin(t)^2+cos(t)^2>0)' before
integral or limit evaluation, for example):
Is  sin(t)^2+cos(t)^2  positive or zero?

- kcrisman
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