Evaluate ∫41−x2 dx\int \frac{4}{\sqrt{1-x^2}}\,dx∫1−x24dx.
4arcsinx+C4\arcsin x + C4arcsinx+C
4arctanx+C4\arctan x + C4arctanx+C
−4arccosx+C-4\arccos x + C−4arccosx+C
Both (a) and (c) — since arcsinx=−arccosx+π/2\arcsin x = -\arccos x + \pi/2arcsinx=−arccosx+π/2