$$$\tan{\left(7 x \right)} \sec^{57}{\left(x \right)}$$$ 的积分
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求$$$\int \tan{\left(7 x \right)} \sec^{57}{\left(x \right)}\, dx$$$。
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求$$$\int \tan{\left(7 x \right)} \sec^{57}{\left(x \right)}\, dx$$$。