Tìm \(\int {\frac{1}{{{x^2}}}{\rm{d}}x} \).

A. \(\int {\frac{1}{{{x^2}}}{\rm{d}}x}  = \frac{1}{x} + C\)

B. \(\int {\frac{1}{{{x^2}}}{\rm{d}}x}  =  - \frac{1}{x} + C\)

C. \(\int {\frac{1}{{{x^2}}}{\rm{d}}x}  = \frac{1}{{2x}} + C\)

D. \(\int {\frac{1}{{{x^2}}}{\rm{d}}x}  = \ln {x^2} + C\)