∫x cos (x/2) dx
u = x
du = 1
dv = cos (x/2)
v = ∫cos (x/2) = 2 sen (x/2)
∫x cos (x/2) dx = 2x sen (x/2) - ∫2 sen (x/2)
∫x cos (x/2) dx = 2x sen (x/2) + 4 cos (x/2) + c
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