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CBSE Class 12 Math 2019 Delhi Set 2 Solved Paper

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Question : 7
Total: 9
If x=cos‌t+log‌tan(‌
t
2
),y=sin‌t, then find the values of ‌
d2y
dt2
 and ‌
d2y
dx2
 at t=‌
π
4
.
Solution:  
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