find in ascending power of the four terms of the expression (1+x+x^2)
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Answer:
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Step-by-step explanation:
We know that
e
x
=1+x+
2!
x
2
+
3!
x
3
+...∞
Hence e
x
−1−x
=
2!
x
2
+
3!
x
3
+...∞
Dividing by x
2
we get
2
1
+
3!
x
+
4!
x
2
+
5!
x
3
+...+
(n+2)!
x
n
+...∞
Hence fourth term is
5!
x
3
.
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