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Problem
Problem
The point at which the slope of the tangent of the function
f
(
x
)
=
e
x
⋅
cos
x
f(x) = e^x \cdot \cos x
f
(
x
)
=
e
x
⋅
cos
x
attains minima, when
x
∈
[
0
,
2
π
]
x \in [0, 2\pi]
x
∈
[
0
,
2
π
]
is a.
π
4
\frac{\pi}{4}
4
π
b.
π
2
\frac{\pi}{2}
2
π
c.
3
π
4
\frac{3\pi}{4}
4
3
π
d.
π
\pi
π
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