integral(abs(cos(x)),(x,0,pi))

asked 2015-04-26 19:06:05 +0100

Vangelis
1 ●1 ●1

this is for sure 2, however it evaluates to -1 !!! Is there anything wrong with the statement itself? Any suggestion?

answered 2015-04-26 21:48:57 +0100

calc314
4191 ●22 ●48 ●113

It is my understanding that Maxima has a difficult time with absolute values in integrals. You can get the answer using a numerical approximation via:

numerical_integral(abs(cos(x)),0,pi)

Or via sympy you can use:

import sympy
print sympy.integrals.integrate(abs(cos(x)),(x,0,pi)).n()

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thanks

Both of your suggestions work!!!

Vangelis ( 2015-04-26 23:35:43 +0100 )edit

@Vangelis: you can mark the answer as accepted: click the check mark on the left.

slelievre ( 2015-04-27 04:16:45 +0100 )edit

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