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Mathematics
Mathematics
Problem
If
∫
f
(
x
)
cos
x
d
x
=
1
2
f
2
(
x
)
+
C
\int f(x) \cos x dx = \frac{1}{2} f^2(x) + C
∫
f
(
x
)
cos
x
d
x
=
2
1
f
2
(
x
)
+
C
, then
f
(
x
)
f(x)
f
(
x
)
can be a.
x
x
x
b. 1 c.
cos
x
\cos x
cos
x
d.
sin
x
\sin x
sin
x
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