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Question: why unknown options method = contour?

Question:why unknown options method = contour?

Ex 90 Maple
contour
October 22 2011
0

int(cos(a*z)/(z^2-4*z+8), z, method=contour)

why run in maple 15, unknown options method = contour

is it default to use contour?

but the result is the same as done by hand, i mean the answer from the book,

int(cos(a*z)/(z^2-4*z+8), z) return contain some Si  and Ci
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