∫e(ax+b) dx = (1/a)e(ax+b) + C
∫eax dx = (1/a) eax + C
∫ex dx = ex + C
Question 1 :
(i) ∫ e3x dx
(ii) ∫e(x+3) dx
(iii) ∫ e(3x+2) dx
(iv) ∫e(5-4x) dxv
(v) ∫ e-x dx
Solution :
(i) ∫ e3x dx = (1/3) e3x + C
(ii) ∫e(x+3) dx = (1/1) e(x+3) + C
= (1/1) e(x+3) + C
(iii) ∫ e(3x+2) dx = (1/3) e(3x+2) + C
= e(3x+2)/3 + C
(iv) ∫e(5-4x) dx = (1/-4) e(5-4x) + C
= -e(5-4x)/4 + C
(v) ∫ e-x dx = e-x/(-1) + C
= - e-x + C
(vi) ∫ 1/e(p+qx) dx = ∫ e-(p+qx) dx
= e-(p+qx)/(-q) + C
= -1/q e(p+qx) + C
Question 2 :
(i) ∫(ex+1)/ex dx
(ii) ∫ex log 2 ex dx
(iii) ∫ex loga ex dx
Solution :
(i) ∫(ex+1)/ex dx
= ∫ [ (ex/ex) + 1/ex ] dx
= ∫dx + ∫e-x dx
= x - e-x + C
(ii) ∫ex log 2 ex dx
= ∫e^log 2x ex dx
= ∫2x ex dx
= ∫(2e)x dx
= (2e)x/log 2e + C
(iii) ∫ex loga ex dx
= ∫e^log ax ex dx
= ∫ax ex dx
= ∫(ae)x dx
= (ae)x/log ae + C
Question 3 :
∫ 5x4 e^x5 dx
Solution :
∫ 5x4 e^x5 dx
Let u = x5
du = 5x4 dx
= ∫ eu du
= eu + C
= e^x5 + C
Question 4 :
∫ ex/(5+ex) dx
Solution :
∫ ex/(5+ex) dx
Let u = 5+ex
du = ex dx
∫ ex/(5+ex) dx = ∫ du/u
= ln u + C
= ln (5+ex) + C
Question 5 :
∫ etan x/cos2x dx
Solution :
∫ etan x/cos2x dx
1/cos2x = sec2x
∫ etan x/cos2x dx = ∫sec2x etan x dx
Let u = tanx
du = sec2x dx
= ∫eu dx
= eu + C
= etan x + C
Question 6 :
∫ e√x/√x dx
Solution :
∫ e√x/√x dx
Let √x = t
1/2√x dx = dt
1/√x dx = 2 dt
= ∫ et (2dt)
= 2∫ et dt
= 2et + C
= 2e√x + C
Question 7 :
∫ e^ sin-1 x/√(1-x2) dx
Solution :
∫ e^ sin-1 x/√(1-x2) dx
Let u = sin-1 x
du = 1/√(1-x2) dx
∫ e^ sin-1 x/√(1-x2) dx = ∫ eu du
= eu + C
= e^sin-1 x + C
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