12. y" − (x + 1)y' - y = 0 O a Ob O O d a. y = a₁ [¹ + ½ x² + ²x¹ + ²x6 + ... ] + a₁ [x + ½ x³ + ½ x5 + ¼ x² + · b. y = a1 + x² + x + 6 1 [√x + 1/² x ²₁ 0 [x + ²/² x ² + 1/² x ³ ·+...+ α₁x₁ c. y = a₁ [1 + + 1/2x² + x3 ¹ + ²/² x ¹ +...] + ao d. y = ax² + x³+x+ + -] + a₂ [\x² + x³ + a1 + ·x³ + +...] 4 += x¹ + x^+] ... ***

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