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If \( \mathrm{x}=\mathrm{a} \sin \theta \) and \( \mathrm{y}=\mathrm{b} \cos \theta \), then \( \frac{\mathrm{d}^{2} \mathrm{y}}{\mathrm{dx}^{2}} \) is
\( \mathrm{P} \)
(1) \( \frac{a}{b^{2}} \sec ^{2} \theta \)
(2) \( \frac{-b}{a} \sec ^{2} \theta \)
W
(3) \( \frac{-b}{a^{2}} \sec ^{3} \theta \)
(4) \( \frac{-b}{a^{2}} \sec ^{3} \theta \)
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