A. Let sin^-1x = y

Where because “cos y” is +ve

⇒ sin y = x

where “x” is +ve as

As sin²y+cos²y = 1

⇒ where

⇒

According to the question,

⇒

⇒

Squaring both sides,

⇒

⇒

As x > 0

⇒