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sympy.integrals.rde.rischDE

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```    or p - Dq does not have an elementary integral over k(t) if b is False.
"""
from sympy.integrals.rde import rischDE

t1 = DE.t
```
```            iDta, iDtd = frac_in(iDt, DE.t, field=True)
try:
va, vd = rischDE(iDta, iDtd, Poly(aa, DE.t), Poly(ad, DE.t), DE)
va, vd = frac_in((va, vd), t1)
except NonElementaryIntegralException:
```

```    or p - Dq does not have an elementary integral over k(t) if b is False.
"""
from sympy.integrals.rde import rischDE

t1 = DE.t
```
```            iDta, iDtd = frac_in(iDt, DE.t, field=True)
try:
va, vd = rischDE(iDta, iDtd, Poly(aa, DE.t), Poly(ad, DE.t), DE)
va, vd = frac_in((va, vd), t1)
except NonElementaryIntegralException:
```

```"""Most of these tests come from the examples in Bronstein's book."""
from sympy import Poly, S, symbols, oo, I
from sympy.integrals.risch import (DifferentialExtension,
NonElementaryIntegralException)
from sympy.integrals.rde import (order_at, order_at_oo, weak_normalizer,
```
```def test_rischDE():
# TODO: Add more tests for rischDE, including ones from the text
DE = DifferentialExtension(extension={'D': [Poly(1, x), Poly(t, t)]})
DE.decrement_level()
assert rischDE(Poly(-2*x, x), Poly(1, x), Poly(1 - 2*x - 2*x**2, x),
```

```"""Most of these tests come from the examples in Bronstein's book."""
from sympy import Poly, S, symbols, oo, I
from sympy.integrals.risch import (DifferentialExtension,
NonElementaryIntegralException)
from sympy.integrals.rde import (order_at, order_at_oo, weak_normalizer,
```
```def test_rischDE():
# TODO: Add more tests for rischDE, including ones from the text
DE = DifferentialExtension(extension={'D': [Poly(1, x), Poly(t, t)]})
DE.decrement_level()
assert rischDE(Poly(-2*x, x), Poly(1, x), Poly(1 - 2*x - 2*x**2, x),
```