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If the sines of the angles A and B of a triangle ABC satisfy the equation `c^2x^2-c(a+b)x+a b=0` , then the triangle (a) is acute angled (b) is right angled (c) is obtuse angled (d) satisfies the equation `sinA+cosA` `((a+b))/c`

A

(i),(iv)

B

(ii), (iii)

C

(iv), (ii)

D

(i), (ii), (iii)

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