Comment #2 on issue 2969 by mario.pe...@gmail.com: sqrt(sin(x)).series(x,
0, 7) is wrong
http://code.google.com/p/sympy/issues/detail?id=2969
p + O(x**7) means that p is equivalent to the sum of its monomials of order
less
than x**7, so that
```
sqrt(x)-x**(5/2)/12+x**(9/2)/1440-x**(13/2)/24192-107*x**(17/2)/29030400 +
O(x**7) =
sqrt(x)-x**(5/2)/12+x**(9/2)/1440-x**(13/2)/24192 + O(x**7)
```
which is the correct result for `sqrt(sin(x)).series(x, 0, 7)`
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