21−x+C2 \sqrt{1-x}+C21−x+C
−1/21−x+C-1 / 2 \sqrt{1-x}+C−1/21−x+C
1/21−x+C1 / 2 \sqrt{1-x}+C1/21−x+C
−21−x+C-2 \sqrt{1-x}+C−21−x+C
