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Problem
Problem
The length of a longest interval in which the function
3
sin
x
−
4
sin
3
x
3 \sin x - 4 \sin^3 x
3
sin
x
−
4
sin
3
x
is increasing, is a.
π
3
\frac{\pi}{3}
3
π
b.
π
2
\frac{\pi}{2}
2
π
c.
3
π
2
\frac{3\pi}{2}
2
3
π
d.
π
\pi
π
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