[치환1]15

1708 days 전, chaijm92 작성

var('a,b,x') f(u)=a+b*x^3/sqrt(3*a*x+b*x^3) integral(f(x),x) 
       
Traceback (click to the left of this block for traceback)
...
Is  b  positive or negative?
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "_sage_input_10.py", line 10, in <module>
    exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8 -*-\\n" + _support_.preparse_worksheet_cell(base64.b64decode("dmFyKCdhLGIseCcpCmYodSk9YStiKnheMy9zcXJ0KDMqYSp4K2IqeF4zKQppbnRlZ3JhbChmKHgpLHgp"),globals())+"\\n"); execfile(os.path.abspath("___code___.py"))
  File "", line 1, in <module>
    
  File "/tmp/tmpesTY8f/___code___.py", line 5, in <module>
    exec compile(u'integral(f(x),x)
  File "", line 1, in <module>
    
  File "/usr/local/sage-5.12/local/lib/python2.7/site-packages/sage/misc/functional.py", line 748, in integral
    return x.integral(*args, **kwds)
  File "expression.pyx", line 9759, in sage.symbolic.expression.Expression.integral (sage/symbolic/expression.cpp:40828)
  File "/usr/local/sage-5.12/local/lib/python2.7/site-packages/sage/symbolic/integration/integral.py", line 690, in integrate
    return indefinite_integral(expression, v)
  File "function.pyx", line 789, in sage.symbolic.function.BuiltinFunction.__call__ (sage/symbolic/function.cpp:7825)
  File "function.pyx", line 435, in sage.symbolic.function.Function.__call__ (sage/symbolic/function.cpp:5230)
  File "/usr/local/sage-5.12/local/lib/python2.7/site-packages/sage/symbolic/integration/integral.py", line 84, in _eval_
    res = integrator(f, x)
  File "/usr/local/sage-5.12/local/lib/python2.7/site-packages/sage/symbolic/integration/external.py", line 19, in maxima_integrator
    result = maxima.sr_integral(expression,v)
  File "/usr/local/sage-5.12/local/lib/python2.7/site-packages/sage/interfaces/maxima_lib.py", line 745, in sr_integral
    raise ValueError, "Computation failed since Maxima requested additional constraints; using the 'assume' command before integral evaluation *may* help (example of legal syntax is 'assume(" + s[4:k] +">0)', see `assume?` for more details)\n" + s
ValueError: Computation failed since Maxima requested additional constraints; using the 'assume' command before integral evaluation *may* help (example of legal syntax is 'assume(b>0)', see `assume?` for more details)
Is  b  positive or negative?