Mark (√) against the correct answer in the following:
If 
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⇒ cos y=2x2 -1
⇒ y=cos-1 (2x2 -1)
Put x = cos θ
⇒ y = cos-1( 2 cos2 θ – 1)
⇒ y = cos -1( cos 2 θ )
⇒ y = 2θ
But θ = cos-1x.
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