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x = a, y = b, y = m x

\frac{1}{2} (b - m a)^{2}

\frac{1}{2 m} (b + m a)^{2}

\frac{1}{2} (b + m a)^{2}

\frac{1}{2 m} (b - m a)^{2}

ANS : 4

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