Using method of variation of parameters, solve  (𝑑2𝑦/𝑑𝑥2) + 𝑎2𝑦 = tan𝑎𝑥

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Using method of variation of parameters, solve  (𝑑²𝑦/𝑑𝑥²) + 𝑎²𝑦 = tan𝑎𝑥

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