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answered 2014-08-16 19:58:19 +0100
Looks like trig_simplify() does the job:
f(t) = cos(t+1)^2 + sin(t+1)^2 f.trig_simplify()
t |--> 1
Where would I find this in the sage documentation if I did not know the name of the method (trig_simplify()) ?