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Mathematics
Mathematics
Problem
The value of
∫
−
π
π
cos
2
x
1
+
a
x
d
x
\int_{-\pi}^{\pi} \frac{\cos^2 x}{1+a^x} dx
∫
−
π
π
1
+
a
x
c
o
s
2
x
d
x
, where
a
>
0
a > 0
a
>
0
, is a.
π
\pi
π
b.
a
π
a\pi
aπ
c.
2
π
2\pi
2
π
d.
π
2
\frac{\pi}{2}
2
π
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