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Mathematics
Mathematics
Problem
If
f
(
x
)
=
3
x
2
−
4
cos
x
f(x)=3x^{2}-4\cos x
f
(
x
)
=
3
x
2
−
4
cos
x
, find
f
′
(
π
/
2
)
f'(\pi/2)
f
′
(
π
/2
)
. a)
3
π
−
4
3\pi-4
3
π
−
4
b)
3
π
2
+
4
\dfrac{3\pi}{2}+4
2
3
π
+
4
c)
3
π
+
4
3\pi+4
3
π
+
4
d)
3
π
3\pi
3
π
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