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Standard XI
Mathematics
NCERT
Question
Find the general solution:
c
o
s
4
x
=
c
o
s
2
x
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Solution
Verified by Toppr
cos
4
x
=
cos
2
x
⇒
2
cos
2
2
x
−
1
−
cos
2
x
=
0
⇒
cos
2
x
=
−
1
2
,
1
⇒
2
x
=
2
n
π
±
π
3
,
2
n
π
⇒
x
=
n
π
±
π
6
,
n
π
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