∫121x2 dx=\displaystyle\int_1^2 \dfrac{1}{x^2}\,dx =∫12x21dx=A222B111C12\tfrac{1}{2}21check_circleD32\tfrac{3}{2}23Explanation[−1/x]12=−1/2−(−1)=1/2[-1/x]_1^2 = -1/2 - (-1) = 1/2[−1/x]12=−1/2−(−1)=1/2.