Question

d (sec^-1x) is equal to: 

विकल्प

• `1/("x" sqrt("x - 1"))`

• `1/("x" sqrt("x"^2 - 1))`

• `1/("x" sqrt("1 + x"^2))`

• `1/("x" sqrt("1 - x"^2))`

Answer 1

`1/("x" sqrt("1 + x"^2))`