UPSC NDA Math Model Paper 5

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Comprehension:(Que No. 25 - 26)
Directions: For the next two (02) items that follow:
Consider the curve x=a(cos‌θ+θ‌sin‌θ) and y=a(sin‌θ−θ‌cos‌θ)
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Question : 26 of 120
 
Marks: +1, -0
What is
d2y
dx2
equal to?
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