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Question

π/4π/4dx1+cos2x is equal to:
  1. 2  
  2. 4    
  3. 0    
  4. 1    


Solution

The correct option is D 1    
I=π/4π/4dx1+cos2x
=2π/40dx1+cos2x     [ 11+cos2x is an even function] 
=2π/40dx2cos2x
=π/40sec2x dx
=[tanx]π/40=1

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