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1.
∫ 5ˣ/(1+5ˣ) dx
u = 1 + 5ˣ --> du = 5ˣ. ln 5 dx
5ˣ dx = 1/ln 5 . du
= 1/ln5 ∫ 1/u du
= 1/ln 5 . ln u + C
= ln (1+5ˣ)/ln 5 + C
2)
∫ (1+3²ˣ)/(3ˣ) dx = ∫ 3⁻ˣ(1 + 3²ˣ) dx
= ∫3⁻ˣ + 3ˣ dx
= - (3⁻ˣ)/ln 3 + (3ˣ)/ln 3
= (3ˣ - 3⁻ˣ) /ln 3 + c
atau
= 3⁻ˣ (3²ˣ -1) /(ln 3) + C
= 3⁻ˣ(9ˣ -1)/(ln 3) + C
..