For x ≤ -1, what is the value of ∫ sec^(-1)x dx?


A) None
B) xsec^(-1)x - ∫ (1)/(√(x^2-1)) dx
C) (1)/(|x|√(1-x^2)) dxsec^(-1)x - ∫ (1)/(√(x^2-1)) dx
D) ∫ (1)/(√(x^2-1)) dxsec^(-1)x + ∫ (1)/(√(x^2-1)) dx