1 Integration of e x ∫ e x.dx = e x + k ∫ e ax+b.dx = e ax+b + k 1a1a.
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1 Integration of e x ∫ e x .dx = e x + k ∫ e ax+b .dx = e ax+b + k 1 a
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Transcript of 1 Integration of e x ∫ e x.dx = e x + k ∫ e ax+b.dx = e ax+b + k 1a1a.
1
Integration of ex
∫ex.dx = ex + k
∫eax+b.dx = eax+b + k1a
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Integration of ex
∫eax+b.dx = eax+b + k1a
Proof
(eax+b) = ddx
eax+b x a = aeax+b
∫a eax+b.dx =
eax+b + k
∫eax+b.dx =
eax+b + k
1a
3
Integration of ex
Example 1
∫e2x.dx = e2x12
∫eax+b.dx = eax+b + k1a
+ k
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Integration of ex
Example 2
∫e3x+1.dx =
13
∫eax+b.dx = eax+b + k1a
1
2
[e3x+1]1
2
13= (e7 –
e4) e7 – e4
3
=Exact = 347.35Approx
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Integration of ex
Example 3Find the volume of the solid of revolution made when the curve y = ex is rotated about the x-axis from x = 0 to x = 2.
Exact
= 84.19 units3 Approx
y = ex
y2 = e2x
∫V = π y2.dxa
b
∫V = π e2x.dx0
2
= [e2x]0
2π2
= (e4 – e0]
π2
= (e4 – 1] units3
π2