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JEE Mains 13-Apr-2023 Shift 2 Solved Paper

Section: Mathematics
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Question : 22 of 90
 
Marks: +1, -0
Let fn=
‌
Ï€
2
∫
0
(
n
∑
k=1
sin‌k−1x)(
n
∑
k=1
(2k−1)sin‌k−1x)‌cos‌x‌dx,n∈N. Then f21−f20 is equal to _________
[13-Apr-2023 shift 2]
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