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Problem
Problem
The number of solution of equation
x
3
+
x
2
+
4
x
+
2
sin
x
=
0
x^3 + x^2 + 4x + 2\sin x = 0
x
3
+
x
2
+
4
x
+
2
sin
x
=
0
in
0
≤
x
≤
2
π
0 \le x \le 2\pi
0
≤
x
≤
2
π
is a. Zero b. One c. Two d. Four
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