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	Các bình luận về: Nguyên hàm của hàm số $f(x)=\tan^2{x}$a) $\int{f(x)}dx=\tan{x}-x+C$b) $\int{f(x)}dx=\tan{x}+x+C$c) $\int{f(x)}dx=-\int\dfrac{1}{\cos^2{x}+xdx}$d) $\int{f(x)}dx=\int\dfrac{1}{\cos^2{x}}-xdx$Lời giải:(Đúng) $\int{f(x)}dx=\tan{x}-x+C$(Vì): Vì đây là kết quả chính xác của nguyên hàm $\int \tan^2{x} dx$	</title>
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