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need to know why g is undefined but when i key in the algebraic function f in integral command seperately got no error and integral answer h appeared ok.Any help or suggestion is much appreciated. Thanks
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cannot integrat...
The same question 
try:
f(x) = Wenn(5 ≤ x ≤ 20, (20 - x)³ / 225, 0)
Integral from undefined == undefined
must have else = 0 in f(x)
can, but not must have in g(x) = If(5 ≤ x ≤ 20, Integral(f))
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