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The simplest form of  is, where -a < x < a

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  2. tan-1 (ax)

Answer (Detailed Solution Below)

Option 4 :
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Detailed Solution

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Explanation:

Let x = a sin θ i.e., θ = 

then 

= 

=  

=  (since sin2θ + cos2θ = 1)

= 

= 

= θ = 

Option (4) is true.

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