integral of dx/e^x+e^-x
Answers
Answered by
2
Answer:
Let S=1+2a+3a
2
+4a
3
+
n−1
Multiply both sides by a, we get
Sa=0+a+2a
2
+3a
3
n−1
+na
n
Subtract both equations,
S(1−a)=1+a+a
2
+a
3
n−1
−na
n
Clearly above series is G.P
Common ratio =a
S(1−a)=
a−1
1(a
n
−1)
−na
n
S=
(a−1)
2
1−(a
n
)
−
1−a
na
n
Similar questions
Geography,
2 months ago
Political Science,
2 months ago
Math,
2 months ago
English,
11 months ago
Hindi,
11 months ago