Can someone please help me.. I'm having no luck with help at all :( I really appreciated if someone would kindly help me with this.

The inverse secant function is often defined for |x| ≥ 1

by y=sec^{ - 1}x <=> sec y = x , 0 ≤ y ≤ π , y ≠ π/2

Verify that the derivative is correct for x > 1