# Revision history [back]

### Integrate() does not integrate

Good Evening

var('phi r')
phi1 = 0
phi2 = 2*pi
r1 = 3
r2 = 5
fpolar = - sqrt(-2*r^2*cos(phi)^2+25)
BI = fpolar
BI= integral(BI, (phi,phi1,phi2))
BI= integral(BI, (r,r1,r2))
BI


the result is:

-integrate(integrate(sqrt(-2*r^2*cos(phi)^2 + 25), phi, 0, 2*pi), r, 3,
5)


I've found no way to make sage integrate the expresion. It repeats my input and iam not given any new information.

When i try

BI.n()


i get

ValueError: Integrand has wrong number of parameters


Same Problem with indefinite Integrals

in:

BI = fpolar
BI= integral(BI, phi)
BI


out:

-integrate(sqrt(-2*r^2*cos(phi)^2 + 25), phi)


Why? what do I need to do to get the desired output?

### Integrate() does not integrate

Good Evening

var('phi r')
phi1 = 0
phi2 = 2*pi
r1 = 3
r2 = 5
fpolar = - sqrt(-2*r^2*cos(phi)^2+25)
BI = fpolar
BI= integral(BI, (phi,phi1,phi2))
BI= integral(BI, (r,r1,r2))
BI


the result is:

-integrate(integrate(sqrt(-2*r^2*cos(phi)^2 + 25), phi, 0, 2*pi), r, 3,
5)


I've found no way to make sage integrate the expresion. It repeats my input and iam not given any new information.

When i try

BI.n()


i get

ValueError: Integrand has wrong number of parameters


Same Problem with indefinite Integrals

in:

BI = fpolar
BI= integral(BI, phi)
BI


out:

-integrate(sqrt(-2*r^2*cos(phi)^2 + 25), phi)


Why? what do I need to do to get the desired output?