\[ \lim _{x \rightarrow 0}\left(\sin ^{2} \frac{\pi}{2-a x}\right)^{\sec ^{2} \frac{\pi}{2-b x}}...

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\[
\lim _{x \rightarrow 0}\left(\sin ^{2} \frac{\pi}{2-a x}\right)^{\sec ^{2} \frac{\pi}{2-b x}}
\]
(a) \( e^{-\frac{a^{2}}{b^{2}}} \)
(b) \( e^{\frac{a^{2}}{b^{2}}} \)
(c) \( e^{\frac{b^{2}}{a^{2}}} \)
(d) \( e^{-\frac{b^{2}}{a^{2}}} \)
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