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三1 . xy=eˣ⁺ᵞ
y+xy'=(1+y')eˣ⁺ᵞ
y'(x-eˣ⁺ᵞ)=(eˣ⁺ᵞ- y)
y' = (eˣ⁺ᵞ - y)/(x-eˣ⁺ᵞ)
三2.(1). y=e-ˣ/2 cos3x
y'=(-1/2)e-ˣ/2 cos3x - 3e-ˣ/2 sin3x = -e-ˣ/2 (cos3x/2 +3sin3x)
y+xy'=(1+y')eˣ⁺ᵞ
y'(x-eˣ⁺ᵞ)=(eˣ⁺ᵞ- y)
y' = (eˣ⁺ᵞ - y)/(x-eˣ⁺ᵞ)
三2.(1). y=e-ˣ/2 cos3x
y'=(-1/2)e-ˣ/2 cos3x - 3e-ˣ/2 sin3x = -e-ˣ/2 (cos3x/2 +3sin3x)
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