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NDA Math Differentiation
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© examsnet.com
Question : 8
Total: 64
If
y
=
cos
x
⋅
cos
4
x
⋅
cos
8
x
, then what is
1
y
d
y
d
x
at
x
=
π
4
equal to?
[NDA-II 2021]
−
1
0
1
3
Validate
Solution:
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