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✨ Best Answer ✨

(1)y = π/2 − xと置換
(2)(sinx)^{n+2} = sinx・(sinx)^{n+1}として部分積分
(3)(tanx)^{n+2} = tan²x・(tanx)^n = (1/cos²x − 1)・(tanx)^nを用いる

また分からなければ聞いてください

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