17) ∫ 1 + t a n 2 x d x {\displaystyle \int _{}^{}1+tan^{2}xdx} =
∫ 1 + s i n 2 x c o s 2 x d x {\displaystyle \int _{}^{}1+{\frac {sin^{2}x}{cos^{2}x}}dx}
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