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Mathematics
Mathematics
Problem
∫
cos
4
x
+
sin
4
x
1
+
cos
4
x
d
x
\int \frac{\cos^4 x + \sin^4 x}{\sqrt{1 + \cos 4x}} dx
∫
1
+
c
o
s
4
x
c
o
s
4
x
+
s
i
n
4
x
d
x
, here
cos
2
x
>
0
\cos 2x > 0
cos
2
x
>
0
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