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Question

If the lines represented by ax2+2hxy+by2=0 are u=a1x+b1y=0 and v=a2x+b2y=0 and are coinciding then:
(a) a1b1=a2b2
(b) a1b1a2b2
(c) a1a1=b1b1
(d) a1a1+b1b1=0

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