I want to calculate the antiderivative for tan(x)
In [4]: x = sp.Symbol('x', real=True)
In [5]: sp.integrate(sp.tan(x), x)
Out[5]: -log(sin(x)**2 - 1)/2
This result is technically correct, but I would (for didactic purposes)
prefer something like
-log(cos(x)).
How can I achieve this?
Thanks.
Carsten.
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