Can't seem to perform the integration below

forget()
a, b, c, x = var('a b c x')
assume((c-b+a)*(c+b-a)>0)


f = 1/(a-b-c*sin(x))

integrate(f, x, 2*pi, 0)


error msg - "Is  (c-b+a)*(c+b-a)  positive or negative?"

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