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Q)

The length of normal to the curve $y = \frac{1}{2} a(e^{x/a} + e^{-x/a})$ is :


( A ) $\frac{y}{a}$
( B ) $\frac{y^2}{a}$
( C ) $\frac{a}{y}$
( D ) $\frac{a}{y^2}$

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