Solve using variation of parameters: y" - 2y + y = ¹/(1+t²) + 3e¹ Type the letter of your answer. Yc = C₁ A+ C₂ Bekt A = B= k= a. 1 b. t c. et d. e-t a. 1 b. t c. 0 d. 1² a. 0 b. 1 c. t d. -1

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