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Trigonometry
hard
0:00.0
Find the maximum of
f
(
x
)
=
sin
4
x
+
cos
4
x
f(x) = \sin^4 x + \cos^4 x
f
(
x
)
=
sin
4
x
+
cos
4
x
.
A
1
B
1/2
C
3/4
D
2
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