So in my ever growing quest to work with sympy, I have expressions like:
y = 2*(x*sin(x) - sin(x) + cos(x))/cos(x)**2
with x values like pi/6
How do I substitute x into y without having evaluate automatically happen.
i.e. I would like to be able to do something like:
y.xreplace({x: pi/6})
>>> 2*((pi/6)*sin(pi/6) - sin(pi/6) + cos(pi/6))/cos(pi/6)**2
It doesn't need to be with xreplace, that's just what I've used here for
explaining my goal.
Thanks!
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