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Problem
Problem
If
lim
x
→
0
(
x
−
3
sin
3
x
+
a
x
−
2
+
b
)
\lim_{x \to 0} (x^{-3} \sin 3x + ax^{-2} + b)
lim
x
→
0
(
x
−
3
sin
3
x
+
a
x
−
2
+
b
)
exists and is equal to zero, the value of
a
+
2
b
a + 2b
a
+
2
b
is .....
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