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Question

The distance between the points (a cos25,0) and (0,a cos65) is ___.


  1. a

  2. acos35

  3. 0.5a

  4. 2a


Solution

The correct option is A

a


Required distance
=(a cos250)2+(0a cos 65)2=a2cos225+a2cos265=a2cos225+a2cos2(9025)=a2cos225+a2sin225=a2(cos225+sin225)=a2×(1)=a

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