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Problem
Problem
If the equation
cos
3
x
cos
3
x
+
sin
3
x
sin
3
x
=
0
\cos 3x \cos^3 x + \sin 3x \sin^3 x = 0
cos
3
x
cos
3
x
+
sin
3
x
sin
3
x
=
0
, then
x
x
x
is equal to a.
(
2
n
+
1
)
π
4
(2n+1)\frac{\pi}{4}
(
2
n
+
1
)
4
π
b.
(
2
n
−
1
)
π
4
(2n-1)\frac{\pi}{4}
(
2
n
−
1
)
4
π
c.
n
π
4
\frac{n\pi}{4}
4
nπ
d. None of these
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