Solve: 
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
⇒ 
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