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If sin-1 x + sin-1 y =  , then cos-1 x + cos-1 y = ? . 

  1. -3π/4
  2. π/4 
  3. -π/4
  4. 3π/2 

Answer (Detailed Solution Below)

Option 2 : π/4 
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Detailed Solution

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Concept:

sin-1 x + cos-1 x =   

Calculation:

sin-1 x + sin-1 y =  

⇒  

⇒ π - ( cos-1 x + cos-1 y ) = 

⇒ cos-1 x + cos-1 y =  

The correct option is 2.

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