The base BC of a triangle ABC is bisected at the point (a, b) and equation to the sides AB and AC are respectively ax + by = 1 and bx + ay = 1. Equation of the median through A is :
A
ax−by=ab
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B
(2b−1)(ax+by)=ab
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C
(2ab−1)(ax+by−1)=(a2+b2−1)(bx+ay−1)
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D
bx−ay=1
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